2-103
XC3000 Logic Cell Array Families
Overview .............................................................. 2-104
XC3000, XC3000A, XC3000L, XC3100, XC3100A
Logic Cell Array Families ................................. 2-105
Architecture...................................................... 2-106
Programmable Interconnect............................. 2-111
Crystal Oscillator.............................................. 2-117
Programming ................................................... 2-118
Special Configuration Functions ...................... 2-122
Master Serial Mode.......................................... 2-124
Master Serial Mode Programming
Switching Characteristics............................. 2-125
Master Parallel Mode ....................................... 2-126
Master Parallel Mode Programming
Switching Characteristics............................. 2-127
Peripheral Mode............................................... 2-128
Peripheral Mode Programming
Switching Characteristics............................. 2-129
Slave Serial Mode............................................ 2-130
Slave Serial Mode Programming
Switching Characteristics............................. 2-131
Program Readback Switching
Characteristics ............................................. 2-131
General LCA Switching Characteristics ........... 2-132
Performance .................................................... 2-133
Power............................................................... 2-134
Pin Descriptions ............................................... 2-136
Pin Functions During Configuration.................. 2-138
XC3000 Families Pin Assignments .................. 2-139
XC3000 Families Pinouts................................. 2-140
Component Availability..................................... 2-151
Ordering Information ........................................ 2-152
XC3000 Logic Cell Array Family........................... 2-153
Absolute Maximum Ratings ............................. 2-154
Operating Conditions ....................................... 2-154
DC Characteristics ........................................... 2-155
Switching Characteristic Guidelines
CLB.............................................................. 2-156
Buffer ........................................................... 2-156
IOB .............................................................. 2-158
Ordering Information ........................................ 2-160
Component Availability..................................... 2-160
Table of Contents
XC3000A Logic Cell Array Familiy ....................... 2-161
Absolute Maximum Ratings ............................. 2-162
Operating Conditions ....................................... 2-162
DC Characteristics ........................................... 2-163
Switching Characteristic Guidelines
CLB.............................................................. 2-164
Buffer ........................................................... 2-164
IOB .............................................................. 2-166
Ordering Information ........................................ 2-168
Component Availability..................................... 2-168
XC3000L Low Voltage Logic Cell Array Family .... 2-169
Absolute Maximum Ratings ............................. 2-170
Operating Conditions ....................................... 2-170
DC Characteristics ........................................... 2-171
Switching Characteristic Guidelines
CLB.............................................................. 2-172
Buffer ........................................................... 2-172
IOB .............................................................. 2-174
Ordering Information ........................................ 2-176
Component Availability..................................... 2-176
XC3100, XC3100A Logic Cell Array Families....... 2-177
Absolute Maximum Ratings ............................. 2-178
Operating Conditions ....................................... 2-178
DC Characteristics ........................................... 2-179
Switching Characteristic Guidelines
CLB.............................................................. 2-180
Buffer ........................................................... 2-180
IOB .............................................................. 2-182
Ordering Information ........................................ 2-184
Component Availability..................................... 2-184
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-104
Overview
Introduced in 1987/88, XC3000 is the industry’s most
successful family of FPGAs, with over 10 million devices
shipped. In 1992/93, Xilinx introduced three additional
families, offering more speed, functionality, and a new
supply-voltage option.
There are now five distinct family groupings within the
XC3000 class of LCA devices.
• XC3000 Family
• XC3000A Family (use for new designs)
• XC3000L Family (use for new designs)
• XC3100 Family
• XC3100A Family (use for new designs)
All five families share a common architecture, develop-
ment software, design and programming methodology,
and also common package pin-outs. An extensive Product
Description covers these common aspects. (Page 2-99).
The much shorter individual Product Specifications then
provide detailed parametric information for the four indi-
vidual product families.
Here is a simple overview.
XC3000 Family
The basic XC3000 family forms the cornerstone for the
rest of the XC3000 class of devices. The basic XC3000
family offers five different device densities with guaran-
teed toggle rates from 70 to 125 MHz.
XC3000A Family
The XC3000A is an enhanced version of the basic XC3000
family, featuring additional interconnect resources and
other user-friendly enhancements. The ease-of-use of the
XC3000A family makes it the obvious choice for all new
designs that do not require the speed of the XC3100 or the
3-V operation of the XC3000L.
XC3000L Family
The XC3000L is identical in architecture and features to
the XC3000A family, but operates at a nominal supply
voltage of 3.3 V. The XC3000L is the right solution for
battery-operated and low-power applications.
XC3100 Family
The XC3100 is a performance-optimized relative of the
basic XC3000 family. While both families are bitstream
and footprint compatible, the XC3100 family extends toggle
rates to 270 MHz and in-system performance to 80 MHz.
The XC3100 family also offers one additional array size,
the XC3195. The XC3100 is best suited for designs that
require the highest clock speed or the shortest net delays.
XC3100A Family
The XC3100A combines the enhanced feature set of the
XC3000A with the performance of the XC3100. It offers the
highest functionality, speed and capacity of all XC3000
families.
The figure below illustrates the relationships between the
families. Compared to the original XC3000 family, XC3000A
offers additional functionality and , coming soon, increased
speed. The XC3000L family offers the same additional
functionality, but reduced speed due to its lower supply
voltage of 3.3 V. The XC3100 family offers no additional
functionality, but substantially higher speed, and higher
density with its new member, the XC3195.
XC3195
Gate Capacity
X3447
Functionality
XC3000L XC3000A
XC3000 XC3100 Speed
XC3100A
2-105
XC3000, XC3000A, XC3000L,
XC3100, XC3100A
Logic Cell Array Families
Features
• Complete line of five related Field Programmable
Gate Array product families
– XC3000, XC3000A, XC3000L, XC3100, XC3100A
• Ideal for a wide range of custom VLSI design tasks
– Replaces TTL, MSI, and other PLD logic
– Integrates complete sub-systems into a single
package
– Avoids the NRE, time delay, and risk of
conventional masked gate arrays
• High-performance CMOS static memory technology
– Guaranteed toggle rates of 70 to 325 MHz, logic
delays from 9 to 2.2 ns
– System clock speeds over 80 MHz
– Low quiescent and active power consumption
• Flexible FPGA architecture
– Compatible arrays ranging from 1,000 to 7,500
gate complexity
– Extensive register, combinatorial, and I/O
capabilities
– High fan-out signal distribution, low-skew clock
nets
– Internal 3-state bus capabilities
– TTL or CMOS input thresholds
– On-chip crystal oscillator amplifier
• Unlimited reprogrammability
– Easy design iteration
– In-system logic changes
• Extensive Packaging Options
– Over 20 different packages
– Plastic and ceramic surface-mount and pin-grid-
array packages
– Thin and Very Thin Quad Flat Pack (TQFP and
VQFP) options
• Ready for volume production
– Standard, off-the-shelf product availability
– 100% factory pre-tested devices
– Excellent reliability record
• Complete XACT Development System
– Schematic capture, automatic place and route
– Logic and timing simulation
– Interactive design editor for design optimization
– Timing calculator
– Interfaces to popular design environments like
Viewlogic, Cadence, Mentor Graphics, and others
Description
The CMOS XC3000 Class of Logic Cell Array (LCA)
families provide a group of high-performance, high-den-
sity, digital integrated circuits. Their regular, extendable,
flexible, user-programmable array architecture is com-
posed of a configuration program store plus three types of
configurable elements: a perimeter of I/O Blocks (IOBs), a
core array of Configurable Logic Bocks (CLBs) and re-
sources for interconnection. The general structure of an
LCA device is shown in Figure 1 on the next page. The
XACT development system provides schematic capture
and auto place-and-route for design entry. Logic and
timing simulation, and in-circuit emulation are available as
design verification alternatives. The design editor is used
for interactive design optimization, and to compile the data
pattern that represents the configuration program.
The LCA user logic functions and interconnections are
determined by the configuration program data stored in
internal static memory cells. The program can be loaded in
any of several modes to accommodate various system
requirements. The program data resides externally in an
EEPROM, EPROM or ROM on the application circuit
board, or on a floppy disk or hard disk. On-chip initialization
logic provides for optional automatic loading of program
data at power-up. The companion XC17XX Serial
Configuration PROMs provide a very simple serial config-
uration program storage in a one-time programmable
package.
User I/Os Horizontal Configuration
Device CLBs Array Max Flip-Flops Longlines Data Bits
XC3020, 3020A, 3020L, 3120, 3120A 64 8 x 8 64 256 16 14,779
XC3030, 3030A, 3030L, 3130, 3130A 100 10 x 10 80 360 20 22,176
XC3042, 3042A, 3042L, 3142, 3142A 144 12 x 12 96 480 24 30,784
XC3064, 3064A, 3064L, 3164, 3164A 224 16 x 14 120 688 32 46,064
XC3090, 3090A, 3090L, 3190, 3190A 320 16 x 20 144 928 40 64,160
XC3195, 3195A 484 22 x 22 176 1,320 44 94,984
Product Description
IMPORTANT NOTICE
All new designs should use XC3000A or
XC3100A. Information on XC3000 and
XC3100 is presented here as reference
for existing designs.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-106
P9 P8 P7 P6 P5 P4 P3 P2 GNDPWR
DN
P11
P12
P13
U61
TCL
KIN
ADACABAA
3-State Buffers With Access
to Horizontal Long Lines Configurable Logic
Blocks
Interconnect Area
BBBA
Frame Pointer
Configuration Memory
I/O Blocks
X3241
Figure 1. Logic Cell Array Structure.
It consists of a perimeter of programmable I/O blocks, a core of configurable logic blocks and their interconnect resources.
These are all controlled by the distributed array of configuration program memory cells.
The XC3000 Logic Cell Array families provide a variety of
logic capacities, package styles, temperature ranges and
speed grades.
Architecture
The perimeter of configurable IOBs provides a pro-
grammable interface between the internal logic array and
the device package pins. The array of CLBs performs
user-specified logic functions. The interconnect resources
are programmed to form networks, carrying logic signals
among blocks, analogous to printed circuit board traces
connecting MSI/SSI packages.
The block logic functions are implemented by programmed
look-up tables. Functional options are implemented by
program-controlled multiplexers. Interconnecting networks
between blocks are implemented with metal segments
joined by program-controlled pass transistors.
These LCA functions are established by a configuration
program which is loaded into an internal, distributed array
of configuration memory cells. The configuration program
is loaded into the LCA device at power-up and may be
reloaded on command. The Logic Cell Array includes logic
and control signals to implement automatic or passive
configuration. Program data may be either bit serial or byte
parallel. The XACT development system generates the
configuration program bitstream used to configure the
LCA device. The memory loading process is independent
of the user logic functions.
Configuration Memory
The static memory cell used for the configuration memory
in the Logic Cell Array has been designed specifically for
high reliability and noise immunity. Integrity of the LCA
device configuration memory based on this design is
assured even under adverse conditions. Compared with
other programming alternatives, static memory provides
the best combination of high density, high performance,
high reliability and comprehensive testability. As shown in
Figure 2, the basic memory cell consists of two CMOS
inverters plus a pass transistor used for writing and read-
ing cell data. The cell is only written during configuration
and only read during readback. During normal operation,
the cell provides continuous control and the pass transistor
is off and does not affect cell stability. This is quite different
from the operation of conventional memory devices, in
which the cells are frequently read and rewritten.
2-107
The method of loading the configuration data is selectable.
Two methods use serial data, while three use byte-wide
data. The internal configuration logic utilizes framing
information, embedded in the program data by the XACT
development system, to direct memory-cell loading. The
serial-data framing and length-count preamble provide
programming compatibility for mixes of various LCA device
devices in a synchronous, serial, daisy-chain fashion.
I/O Block
Each user-configurable IOB shown in Figure 3, provides
an interface between the external package pin of the
device and the internal user logic. Each IOB includes both
registered and direct input paths. Each IOB provides a
programmable 3-state output buffer, which may be driven
by a registered or direct output signal. Configuration
options allow each IOB an inversion, a controlled slew rate
and a high impedance pull-up. Each input circuit also
provides input clamping diodes to provide electrostatic
protection, and circuits to inhibit latch-up produced by
input currents.
FLIP
FLOP
QD
R
SLEW
RATE PASSIVE
PULL UP
OUTPUT
SELECT
3-STATE
INVERT
OUT
INVERT
FLIP
FLOP
or
LATCH
DQ
R
REGISTERED IN
DIRECT IN
OUT
3- STATE
(OUTPUT ENABLE)
TTL or
CMOS
INPUT
THRESHOLD
OUTPUT
BUFFER
(GLOBAL RESET)
CK1
X3029
I/O PAD
Vcc
PROGRAM-CONTROLLED MEMORY CELLS
PROGRAMMABLE INTERCONNECTION POINT or PIP
=
IKOK
Q
I
O
T
PROGRAM
CONTROLLED
MULTIPLEXER
CK2
Figure 3. Input/Output Block.
Each IOB includes input and output storage elements and I/O options selected by configuration memory cells. A choice of two
clocks is available on each die edge. The polarity of each clock line (not each flip-flop or latch) is programmable. A clock line that
triggers the flip-flop on the rising edge is an active Low Latch Enable (Latch transparent) signal and vice versa. Passive pull-up can
only be enabled on inputs, not on outputs. All user inputs are programmed for TTL or CMOS thresholds.
Figure 2. Static Configuration Memory Cell.
It is loaded with one bit of configuration program and
controls one program selection in the Logic Cell Array.
The memory cell outputs Q and Q use ground and VCC
levels and provide continuous, direct control. The addi-
tional capacitive load together with the absence of address
decoding and sense amplifiers provide high stability to the
cell. Due to the structure of the configuration memory
cells,
they are not affected by extreme power-supply excursions
or very high levels of alpha particle radiation. In reliability
testing, no soft errors have been observed even in the
presence of very high doses of alpha radiation.
Q
Data
Read or
Write
Configuration
Control
Q
X5382
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-108
(IOB) pin FT can control output activity. An open-drain
output may be obtained by using the same signal for
driving the output and 3-state signal nets so that the buffer
output is enabled only for a Low.
Configuration program bits for each IOB control features
such as optional output register, logic signal inversion, and
3-state and slew-rate control of the output.
The program-controlled memory cells of Figure 3 control
the following options.
•Logic inversion of the output is controlled by one
configuration program bit per IOB.
•Logic 3-state control of each IOB output buffer is
determined by the states of configuration program bits
which turn the buffer on, or off, or select the output buffer
3-state control interconnection (IOB pin T). When this
IOB output control signal is High, a logic one, the buffer
is disabled and the package pin is high impedance.
When this IOB output control signal is Low, a logic zero,
the buffer is enabled and the package pin is active.
Inversion of the buffer 3-state control-
logic sense (output
enable) is controlled by an additiona
l configuration
program bit.
•Direct or registered output is selectable for each IOB.
The register uses a positive-edge, clocked flip-flop. The
clock source may be supplied (IOB pin OK) by either of
two metal lines available along each die edge. Each of
these lines is driven by an invertible buffer.
•Increased output transition speed can be selected to
improve critical timing. Slower transitions reduce
capacitive-load peak currents of non-critical outputs and
minimize system noise.
•An internal high-impedance pull-up resistor (active by
default) prevents unconnected inputs from floating.
Summary of I/O Options
•Inputs
– Direct
– Flip-flop/latch
– CMOS/TTL threshold (chip inputs)
– Pull-up resistor/open circuit
•Outputs
– Direct/registered
– Inverted/not
– 3-state/on/off
– Full speed/slew limited
– 3-state/output enable (inverse)
The input-buffer portion of each IOB provides threshold
detection to translate external signals applied to the
package pin to internal logic levels. The global input-buffer
threshold of the IOBs can be programmed to be
compatible with either TTL or CMOS levels. The buffered
input signal drives the data input of a storage element,
which may be configured as either a flip-flop or a latch. The
clocking polarity (rising/falling edge-triggered flip-flop,
High/Low transparent latch) is programmable for each of
the two clock lines on each of the four die edges. Note that
a clock line driving a
rising
edge-triggered flip-flop makes
any latch driven by the same line on the same edge
Low
-
level transparent and vice versa (
falling
edge,
High
transparent). All Xilinx primitives in the supported
schematic-entry packages, however, are positive edge-
triggered flip-flops or High transparent latches. When one
clock line must drive flip-flops as well as latches, it is
necessary to compensate for the difference in clocking
polarities with an additional inverter either in the flip-flop
clock input or the latch-enable input. I/O storage elements
are reset during configuration or by the active-Low chip
RESET input. Both direct input (from IOB pin I) and
registered input (from IOB pin Q) signals are available for
interconnect.
For reliable operation, inputs should have transition times
of less than 100 ns and should not be left floating. Floating
CMOS input-pin circuits might be at threshold and produce
oscillations. This can produce additional power dissipation
and system noise. A typical hysteresis of about 300 mV
reduces sensitivity to input noise. Each user IOB includes
a programmable high-impedance pull-up resistor, which
may be selected by the program to provide a constant High
for otherwise undriven package pins. Although the Logic
Cell Array provides circuitry to provide input protection for
electrostatic discharge, normal CMOS handling precau-
tions should be observed.
Flip-flop loop delays for the IOB and logic-block flip-flops
are about 3 ns. This short delay provides good perfor-
mance under asynchronous clock and data conditions.
Short loop delays minimize the probability of a metastable
condition that can result from assertion of the clock during
data transitions. Because of the short-loop-delay charac-
teristic in the Logic Cell Array, the IOB flip-flops can be
used to synchronize external signals applied to the device.
Once synchronized in the IOB, the signals can be used
internally without further consideration of their clock rela-
tive timing, except as it applies to the internal logic and
routing-path delays.
IOB output buffers provide CMOS-compatible 4-mA
source-or-sink drive for high fan-out CMOS or TTL- com-
patible signal levels (8 mA in the XC3100 family). The
network driving IOB pin O becomes the registered or direct
data source for the output buffer. The 3-state control signal
2-109
Figure 4. Configurable Logic Block. Each CLB includes a combinatorial logic section, two flip-flops and a program
memory controlled multiplexer selection of function. It has. five logic variable inputs A, B, C, D, and E
a direct data in DI
an enable clock EC
a clock (invertible) K
an asynchronous direct RESET RD
two outputs X and Y
Configurable Logic Block
The array of CLBs provides the functional elements from
which the user’s logic is constructed. The logic blocks are
arranged in a matrix within the perimeter of IOBs. The
XC3020 has 64 such blocks arranged in 8 rows and 8
columns. The XACT development system is used to com-
pile the configuration data which is to be loaded into the
internal configuration memory to define the operation and
interconnection of each block. User definition of CLBs and
their interconnecting networks may be done by automatic
translation from a schematic-capture logic diagram or
optionally by installing library or user macros.
Each CLB has a combinatorial logic section, two flip-flops,
and an internal control section. See Figure 4. There are:
five logic inputs (A, B, C, D and E); a common clock input
(K); an asynchronous direct RESET input (RD); and an
enable clock (EC). All may be driven from the interconnect
resources adjacent to the blocks. Each CLB also has two
outputs (X and Y) which may drive interconnect networks.
Data input for either flip-flop within a CLB is supplied from
the function F or G outputs of the combinatorial logic, or the
block input, DI. Both flip-flops in each CLB share the
Q
COMBINATORIAL
FUNCTION
LOGIC
VARIABLES
D
RD
G
F
DIN
F
G
QX
QY
DIN
F
G
G
QY
QX
F
QD
RD
ENABLE CLOCK
CLOCK
DIRECT
RESET
1 (ENABLE)
A
B
C
D
E
DI
EC
K
RD
Y
X
X3032
0 (INHIBIT)
(GLOBAL RESET)
CLB OUTPUTS
DATA IN 0
1
0
1
MUX
MUX
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-110
Figure 5
5a. Combinatorial Logic Option FG generates two functions
of four variables each. One variable, A, must be common
to both functions. The second and third variable can be
any choice of of B, C, QX and QY The fourth variable
can be any choice of D or E.
5b. Combinatorial Logic Option F generates any function of
five variables: A, D, E and and two choices out of B, C,
QX, QY.
5c. Combinatorial Logic Option FGM allows variable E to
select between two functions of four variables: Both have
common inputs A and D and any choice out of B, C, QX
and QY for the remaining two variables. Option 3 can
then implement some functions of six or seven variables.
QY Any Function
of Up to 4
Variables
QY Any Function
of Up to 4
Variables
QY Any Function
of 5 Variables
QY Any Function
of Up to 4
Variables
QY Any Function
of Up to 4
Variables
5c
5b
5a
QX
QX
QX
QX
QX
A
B
C
D
A
B
C
D
E
E
A
B
C
D
E
D
A
B
C
D
C
A
B
M
U
X
F
G
F
G
F
G
E
X5442
FGM
Mode
D Q
D Q
D Q
Count Enable
Parallel Enable
Clock
D2
D1
D0
Dual Function of 4 Variables
Function of 6 Variables
Function of 5 Variables
Q2
Q1
Q0
FG
Mode
F
Mode
FGM
Mode
Terminal
Count
X5383
Figure 6. C8BCP Macro.
The C8BCP macro (modulo-8 binary counter with parallel
enable and clock enable) uses one combinatorial logic block
of each option.
2-111
switch connections to block inputs are unidirec-
tional, as are block outputs, they are usable only for
block input connection and not for routing.
Figure 8
illustrates routing access to logic block input variables,
control inputs and block outputs. Three types of metal
resources are provided to accommodate various network
interconnect requirements.
• General Purpose Interconnect
• Direct Connection
• Longlines (multiplexed busses and wide AND gates)
General Purpose Interconnect
General purpose interconnect, as shown in Figure 9,
consists of a grid of five horizontal and five vertical metal
segments located between the rows and columns of logic
and IOBs. Each segment is the height or width of a logic
block. Switching matrices join the ends of these segments
and allow programmed interconnections between the
metal grid segments of adjoining rows and columns. The
switches of an unprogrammed device are all non-
conducting. The connections through the switch matrix
may be established by the automatic routing or by using
Editnet to select the desired pairs of matrix pins to be
connected or disconnected. The legitimate switching
matrix combinations for each pin are indicated in Figure 10
and may be highlighted by the use of the Show-Matrix
command in the XACT system.
asynchronous RD which, when enabled and High, is
dominant over clocked inputs. All flip-flops are reset by the
active-Low chip input, RESET, or during the configuration
process. The flip-flops share the enable clock (EC) which,
when Low, recirculates the flip-flops’ present states and
inhibits response to the data-in or combinatorial function
inputs on a CLB. The user may enable these control inputs
and select their sources. The user may also select the
clock net input (K), as well as its active sense within each
CLB. This programmable inversion eliminates the need to
route both phases of a clock signal throughout the device.
Flexible routing allows use of common or individual CLB
clocking.
The combinatorial-logic portion of the CLB uses a 32 by 1
look-up table to implement Boolean functions. Variables
selected from the five logic inputs and two internal block
flip-flops are used as table address inputs. The combina-
torial propagation delay through the network is indepen-
dent of the logic function generated and is spike free for
single input variable changes. This technique can gener-
ate two independent logic functions of up to four variables
each as shown in Figure 5a, or a single function of five
variables as shown in Figure 5b, or some functions of
seven variables as shown in Figure 5c. Figure 6 shows a
modulo-8 binary counter with parallel enable. It uses one
CLB of each type. The partial functions of six or seven
variables are implemented using the input variable (E) to
dynamically select between two functions of four different
variables. For the two functions of four variables each, the
independent results (F and G) may be used as data inputs
to either flip-flop or either logic block output. For the single
function of five variables and merged functions of six or
seven variables, the F and G outputs are identical. Sym-
metry of the F and G functions and the flip-flops allows the
interchange of CLB outputs to optimize routing efficiencies
of the networks interconnecting the CLBs and IOBs.
Programmable Interconnect
Programmable-interconnection resources in the Logic
Cell Array provide routing paths to connect inputs and
outputs of the IOBs and CLBs into logic networks. Inter-
connections between blocks are composed of a two-layer
grid of metal segments. Specially designed pass transis-
tors, each controlled by a configuration bit, form program-
mable interconnect points (PIPs) and switching matrices
used to implement the necessary connections between
selected metal segments and block pins. Figure 7 is an
example of a routed net. The XACT development system
provides automatic routing of these interconnections. In-
teractive routing (Editnet) is also available for design
optimization. The inputs of the CLBs or IOBs are multiplex-
ers which can be programmed to select an input network
from the adjacent interconnect segments.
Since the
Figure 7.
An XACT view of routing resources used to form a typical
interconnection network from CLB GA.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-112
X2662
Figure 8. XACT Development System Locations of interconnect access, CLB control inputs, logic inputs and outputs. The dot
pattern represents the available programmable interconnection points (PIPs).
Some of the interconnect PIPs are directional. This is indicated on the XACT design editor status line:
ND is a nondirectional interconnection.
D:H->V is a PIP that drives from a horizontal to a vertical line.
D:V->H is a PIP that drives from a vertical to a horizontal line.
D:C->T is a “T” PIP that drives from a cross of a T to the tail.
D:CW is a corner PIP that drives in the clockwise direction.
P0 indicates the PIP is non-conducting , P1 is on.
2-113
Figure 10. Switch Matrix Interconnection Options for Each
Pin. Switch matrices on the edges are different. Use Show
Matrix menu option in the XACT system
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
Special buffers within the general interconnect areas pro-
vide periodic signal isolation and restoration for improved
performance of lengthy nets. The interconnect buffers are
available to propagate signals in either direction on a given
general interconnect segment. These bidirectional (bidi)
buffers are found adjacent to the switching matrices,
above and to the right and may be highlighted by the use
of the Show BIDI command in the XACT system. The other
PIPs adjacent to the matrices are accessed to or from
Longlines. The development system automatically de-
fines the buffer direction based on the location of the
interconnection network source. The delay calculator of
the XACT development system automatically calculates
and displays the block, interconnect and buffer delays for
any paths selected. Generation of the simulation netlist
with a worst-case delay model is provided by an XACT
option.
Direct Interconnect
Direct interconnect, shown in Figure 11, provides the most
efficient implementation of networks between adjacent
CLBs or I/O Blocks. Signals routed from block to block
using the direct interconnect exhibit minimum interconnect
propagation and use no general interconnect resources.
For each CLB, the X output may be connected directly to
the B input of the CLB immediately to its right and to the C
input of the CLB to its left. The Y output can use direct
interconnect to drive the D input of the block immediately
above and the A input of the block below. Direct intercon-
X2664
Figure 9. LCA General-Purpose Interconnect.
Composed of a grid of metal segments that may be intercon-
nected through switch matrices to form networks for CLB and
IOB inputs and outputs.
1105 13
Figure 11. CLB X and Y Outputs.
The X and Y outputs of each CLB have single contact, direct
access to inputs of adjacent CLBs
X2663
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-114
X2660
Figure 12. XC3020 Die-Edge IOBs. The XC3020 die-edge IOBs are provided with direct access to adjacent CLBs.
2-115
X1243
Figure 13. Horizontal and Vertical Longlines. These Longlines provide high fan-out, low-skew signal distribution in each row and
column. The global buffer in the upper left die corner drives a common line throughout the LCA device.
nect should be used to maximize the speed of high-
performance portions of logic. Where logic blocks are
adjacent to IOBs, direct connect is provided alternately to
the IOB inputs (I) and outputs (O) on all four edges of the
die. The right edge provides additional direct connects
from CLB outputs to adjacent IOBs. Direct interconnec-
tions of IOBs with CLBs are shown in Figure 12.
Longlines
The Longlines bypass the switch matrices and are in-
tended primarily for signals that must travel a long dis-
tance, or must have minimum skew among multiple des-
tinations. Longlines, shown in Figure 13, run vertically and
horizontally the height or width of the interconnect area.
Each interconnection column has three vertical Longlines,
and each interconnection row has two horizontal Lon-
glines. Two additional Longlines are located adjacent to
the outer sets of switching matrices. In devices larger than
the XC3020, two vertical Longlines in each column are
connectable half-length lines. On the XC3020, only the
outer Longlines are connectable half-length lines.
Longlines can be driven by a logic block or IOB output on
a column-by-column basis. This capability provides a
common low skew control or clock line within each column
of logic blocks. Interconnections of these Longlines are
shown in Figure 14. Isolation buffers are provided at each
input to a Longline and are enabled automatically by the
development system when a connection is made.
A buffer in the upper left corner of the LCA chip drives a
global net which is available to all K inputs of logic blocks.
Using the global buffer for a clock signal provides a skew-
free, high fan-out, synchronized clock for use at any or all
of the IOBs and CLBs. Configuration bits for the K input to
each logic block can select this global line or another
routing resource as the clock source for its flip-flops. This
net may also be programmed to drive the die edge clock
lines for IOB use. An enhanced speed, CMOS threshold,
direct access to this buffer is available at the second pad
from the top of the left die edge.
A buffer in the lower right corner of the array drives a
horizontal Longline that can drive programmed connec-
tions to a vertical Longline in each interconnection column.
This alter nate buffer also has low skew and high fan-out.
The network formed by this alternate buffer’s Longlines
can be selected to drive the K inputs of the CLBs . CMOS
threshold, high speed access to this buffer is available from
the third pad from the bottom of the right die edge.
Internal Busses
A pair of 3-state buffers, located adjacent to each CLB,
permits logic to drive the horizontal Longlines. Logic op-
eration of the 3-state buffer controls allows them to imple-
ment wide multiplexing functions. Any 3-state buffer input
can be selected as drive for the horizontal long-line bus by
applying a Low logic level on its 3-state control line. See
Figure 15a. The user is required to avoid contention which
can result from multiple drivers with opposing logic levels.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-116
Control of the 3-state input by the same signal that drives
the buffer input, creates an open-drain wired-AND func-
tion. A logic High on both buffer inputs creates a high
impedance, which represents no contention. A logic Low
enables the buffer to drive the Longline Low. See Figure
15b. Pull-up resistors are available at each end of the
Longline to provide a High output when all connected
buffers are non-conducting. This forms fast, wide gating
functions. When data drives the inputs, and separate
signals drive the 3-state control lines, these buffers form
multiplexers (3-state busses). In this case, care must be
used to prevent contention through multiple active buffers
Figure 14. Programmable Interconnection of Longlines. This is provided at the edges of the routing area. Three-state buffers
allow the use of horizontal Longlines to form on-chip wired AND and multiplexed buses. The left two non-clock vertical Longlines
per column (except XC3020) and the outer perimeter Longlines may be programmed as connectible half-length lines.
X1244
X1741
D
A
A
D
B
B
D
C
C
D
N
N
D
A
A•+=D
B
B•+D
C
C•+ D
N
N•Z…+
WEAK
KEEPER
CIRCUIT
Figure 15b. 3-State Buffers Implement a Multiplexer. The selection is accomplished by the buffer 3-state signal.
V
CC
D
A
D
B
D
C
D
N
V
CC
Z
=
D
A
•
D
B
•
D
C
•
...
•
D
N
X3036
(LOW)
T OE
Figure 15a. 3-State Buffers Implement a Wired-AND Function. When all the buffer 3-state
lines are High, (high impedance), the pull-up resistor(s) provide the High output. The buffer
inputs are driven by the control signals or a Low.
2-117
option is available to assure symmetry. The oscillator
circuit becomes active early in the configuration process to
allow the oscillator to stabilize. Actual internal connection
is delayed until completion of configuration. In Figure 17
the feedback resistor R1, between the output and input,
biases the amplifier at threshold. The inversion of the
amplifier, together with the R-C networks and an AT-cut
series resonant crystal, produce the 360-degree phase
shift of the Pierce oscillator. A series resistor R2 may be
included to add to the amplifier output impedance when
needed for phase-shift control, crystal resistance match-
ing, or to limit the amplifier input swing to control clipping
at large amplitudes. Excess feedback voltage may be
corrected by the ratio of C2/C1. The amplifier is designed
to be used from 1 MHz to about one-half the specified CLB
toggle frequency. Use at frequencies below 1 MHz may
require individual characterization with respect to a series
of conflicting levels on a common line. Each horizontal
Longline is also driven by a weak keeper circuit that
prevents undefined floating levels by maintaining the pre-
vious logic level when the line is not driven by an active
buffer or a pull-up resistor. Figure 16 shows 3-state buff-
ers, Longlines and pull-up resistors.
Crystal Oscillator
Figure 16 also shows the location of an internal high speed
inverting amplifier which may be used to implement an on-
chip crystal oscillator. It is associated with the auxiliary
buffer in the lower right corner of the die. When the
oscillator is configured by MakeBits and connected as a
signal source, two special user IOBs are also configured to
connect the oscillator amplifier with external crystal oscil-
lator components as shown in Figure 17. A divide by two
X1245
Figure 16. XACT Development System. An extra large view of possible interconnections in the lower right corner of the XC3020.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-118
Table 1
M0 M1 M2 CCLK Mode Data
0 0 0 output Master Bit Serial
0 0 1 output Master Byte Wide Addr. = 0000 up
0 1 0 — reserved —
0 1 1 output Master Byte Wide Addr. = FFFF
down
1 0 0 — reserved —
1 0 1 output Peripheral Byte Wide
1 1 0 — reserved —
1 1 1 input Slave Bit Serial
Alternate
Clock Buffer XTAL1
XTAL2
(IN)
R1
R2
Y1
C1 C2
Internal External
R1
R2
C1, C2
Y1
Suggested Component Values
0.5 – 1 MΩ
0 – 1 kΩ
(may be required for low frequency, phase)t
(shift and/or compensation level for crystal Q)
10 – 40 pF
1 – 20 MHz AT-cut parallel resonant
X5302
68 PIN
PLCC
47
43
84 PIN
PLCC
57
53
PGA
J11
L11
132 PIN
PGA
P13
M13
160 PIN
PQFP
82
76
XTAL 1 (OUT)
XTAL 2 (IN)
100 PIN
CQFP
67
61
PQFP
82
76
164 PIN
CQFP
105
99
44 PIN
PLCC
30
26
175 PIN
PGA
T14
P15
208 PIN
PQFP
110
100
D Q
resistance. Crystal oscillators above 20 MHz generally
require a crystal which operates in a third overtone mode,
where the fundamental frequency must be suppressed by
an inductor across C2, turning this parallel resonant circuit
to double the fundamental crystal frequency, i.e., 2/3 of the
desired third harmonic frequency network. When the oscil-
lator inverter is not used, these IOBs and their package
pins are available for general user I/O.
Programming
Initialization Phase
An internal power-on-reset circuit is triggered when power
is applied. When Vcc reaches the voltage at which portions
of the LCA device begin to operate (nominally 2.5 to 3 V),
the programmable I/O output buffers are 3-stated and a
high-impedance pull-up resistor is provided for the user
I/O pins. A time-out delay is initiated to allow the power
supply voltage to stabilize. During this time the power-
down mode is inhibited. The Initialization state time-out
(about 11 to 33 ms) is determined by a 14-bit counter
driven by a self-generated internal timer. This nominal 1-
MHz timer is subject to variations with process, tempera-
ture and power supply. As shown in Table 1, five configu-
ration mode choices are available as determined by the
input levels of three mode pins; M0, M1 and M2.
In Master configuration modes, the LCA device becomes
the source of the Configuration Clock (CCLK). The begin-
ning of configuration of devices using Peripheral or Slave
modes must be delayed long enough for their initialization
to be completed. An LCA device with mode lines selecting
a Master configuration mode extends its initialization state
using four times the delay (43 to 130 ms) to assure that all
daisy-chained slave devices, which it may be driving, will
Figure 17. Crystal Oscillator Inverter. When activated in the MakeBits program and by selecting an output network for its buffer,
the crystal oscillator inverter uses two unconfigured package pins and external components to implement an oscillator. An optional
divide-by-two mode is available to assure symmetry.
2-119
All User I/O Pins 3-Stated with High Impedance Pull-Up, HDC=High, LDC=Low
Initialization
Power-On
Time Delay
Clear
Configuration
Memory
Test
Mode Pins Configuration
Program Mode Start-Up Operational
Mode
Power Down
No HDC, LDC
or Pull-Up
No
X3399
INIT Output = Low
Clear Is
~ 200 Cycles for the XC3020—130 to 400 µs
~ 250 Cycles for the XC3030—165 to 500 µs
~ 290 Cycles for the XC3042—195 to 580 µs
~ 330 Cycles for the XC3064—220 to 660 µs
~ 375 Cycles for the XC3090—250 to 750 µs
RESET
Active
PWRDWN
Inactive PWRDWN
Active
Active RESET
Operates on
User Logic
Low on DONE/PROGRAM and RESET
Active RESET
Power-On Delay is
2
14
Cycles for Non-Master Mode—11 to 33 ms
2
16
Cycles for Master Mode—43 to 130 ms
Figure 18. A State Diagram of the Configuration Process for Power-up and Reprogram.
be ready even if the master is very fast, and the slave(s)
very slow. Figure 18 shows the state sequences. At the
end of Initialization, the LCA device enters the Clear state
where it clears the configuration memory. The active Low,
open-drain initialization signal INIT indicates when the
Initialization and Clear states are complete. The LCA
device tests for the absence of an external active Low
RESET before it makes a final sample of the mode lines
and enters the Configuration state. An external wired-AND
of one or more INIT pins can be used to control configura-
tion by the assertion of the active-Low RESET of a master
mode device or to signal a processor that the LCA devices
are not yet initialized.
If a configuration has begun, a re-assertion of RESET for
a minimum of three internal timer cycles will be recognized
and the LCA device will initiate an abort, returning to the
Clear state to clear the partially loaded configuration
memory words. The LCA device will then resample RE-
SET and the mode lines before re-entering the Configura-
tion state.
A re-program is initiated.when a configured XC3000 family
device senses a High-to-Low transition and subsequent
>6 µs Low level on the Done/PROG package pin, or, if this
pin is externally held permanently Low, a High-to-Low
transition and subsequent >6 µs Low time on the RESET
package pin.
The LCA device returns to the Clear state where the
configuration memory is cleared and mode lines re-
sampled, as for an aborted configuration. The complete
configuration program is cleared and loaded during each
configuration program cycle.
Length count control allows a system of multiple Logic Cell
Arrays, of assorted sizes, to begin operation in a synchro-
nized fashion. The configuration program generated by
the MakePROM program of the XACT development sys-
tem begins with a preamble of 111111110010 followed by
a 24-bit length count representing the total number of
configuration clocks needed to complete loading of the
configuration program(s). The data framing is shown in
Figure 19. All LCA devices connected in series read and
shift preamble and length count in on positive and out on
negative configuration clock edges. An LCA device which
has received the preamble and length count then presents
a High Data Out until it has intercepted the appropriate
number of data frames. When the configuration program
memory of an LCA device is full and the length count does
not yet compare, the LCA device shifts any additional data
through, as it did for preamble and length count.
When the LCA device configuration memory is full and the
length count compares, the LCA device will execute a
synchronous start-up sequence and become operational.
See Figure 20. Two CCLK cycles after the completion of
loading configuration data, the user I/O pins are enabled
as configured. As selected in MakeBits, the internal user-
logic RESET is released either one clock cycle before or
after the I/O pins become active. A similar timing selection
is programmable for the DONE/PROG output signal.
DONE/PROG may also be programmed to be an open
drain or include a pull-up resistor to accommodate wired
ANDing. The High During Configuration (HDC) and Low
During Configuration (LDC) are two user I/O pins which are
driven active while an LCA device is in its Initialization,
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-120
XC3020 XC3030 XC3042 XC3064 XC3090
XC3020A XC3030A XC3042A XC3064A XC3090A
XC3020L XC3030L XC3042L XC3064L XC3090L
XC3120 XC3130 XC3142 XC3164 XC3190 XC3195
Device XC3120A XC3130A XC3142A XC3164A XC3190A XC3195A
Gates 1,000 to 1,500 to 2,000 to 3,500 to 5,000 to 6,500 to
1,500 2,000 3,000 4,500 6,000 7,500
CLBs 64 100 144 224 320 484
Row x Col (8 x 8) (10 x 10) (12 x 12) (16 x 14) (20 x 16) (22 x 22)
IOBs 64 80 96 120 144 176
Flip-flops 256 360 480 688 928 1,320
Horizontal Longlines 16 20 24 32 40 44
TBUFs/Horizontal LL 9 11 13 15 17 23
Bits per Frame 75 92 108 140 172 188
(including1 start and 3 stop bits)
Frames 197 241 285 329 373 505
Program Data = 14,779 22,176 30,784 46,064 64,160 94,944
Bits x Frames + 4 bits
(excludes header)
PROM size (bits) = 14,819 22,216 30,824 46,104 64,200 94,984
Program Data
+ 40-bit Header
Clear or Configure states. They and DONE/PROG provide
signals for control of external logic signals such as RESET,
bus enable or PROM enable during configuration. For
parallel Master configuration modes, these signals pro-
vide PROM enable control and allow the data pins to be
shared with user logic signals.
User I/O inputs can be programmed to be either TTL or
CMOS compatible thresholds. At power-up, all inputs
have TTL thresholds and can change to CMOS thresholds
at the completion of configuration if the user has selected
CMOS thresholds. The threshold of PWRDWN and the
direct clock inputs are fixed at a CMOS level.
If the crystal oscillator is used, it will begin operation before
configuration is complete to allow time for stabilization
before it is connected to the internal circuitry.
Configuration Data
Configuration data to define the function and interconnec-
tion within a Logic Cell Array is loaded from an external
11111111
0010
< 24-Bit Length Count >
1111
0 <Data Frame # 001 > 111
0 <Data Frame # 002 > 111
0 <Data Frame # 003 > 111
. . .
. . .
. . .
. . .
0 <Data Frame # 196 > 111
0 <Data Frame # 197 > 111
1111
—Dummy Bits*
—Preamble Code
—Configuration Program Length
—Dummy Bits (4 Bits Minimum)
For XC3120
197 Configuration Data Frames
(Each Frame Consists of:
A Start Bit (0)
A 71-Bit Data Field
Three Stop Bits
Postamble Code (4 Bits Minimum)
Header
Program Data
Repeated for Each Logic
Cell Array in a Daisy Chain
*The LCA Device Require Four Dummy Bits Min; XACT Software Generates Eight Dummy Bits
X5300
Figure 19. Internal Configuration Data Structure for an LCA Device. This shows the preamble, length count and data frames
generated by the XACT Development System.
The Length Count produced by the MakeBits program = [(40-bit preamble + sum of program data + 1 per daisy chain device)
rounded up to multiple of 8] – (2 ≤ K ≤ 4) where K is a function of DONE and RESET timing selected. An additional 8 is added
if roundup increment is less than K. K additional clocks are needed to complete start-up after length count is reached.
2-121
Preamble Length Count Data
12 24 4 Data Frame
Start
Bit Start
Bit
34
Last Frame Postamble
I/O Active
DONE
Internal Reset
Length Count*
The configuration data consists of a composite
40-bit preamble/length count, followed by one or
more concatenated LCA programs, separated by
4-bit postambles. An additional final postamble bit
is added for each slave device and the result rounded
up to a byte boundary. The length count is two less
than the number of resulting bits.
Timing of the assertion of DONE and
termination of the INTERNAL RESET
may each be programmed to occur
one cycle before or after the I/O outputs
become active.
Heavy lines indicate the default condition X5303
PROGRAM
Weak Pull-Up
*
Stop
3
STOP
DIN
Figure 20. Configuration and Start-up of One or More LCA Devices.
storage at power-up and after a re-program signal. Several
methods of automatic and controlled loading of the re-
quired data are available. Logic levels applied to mode
selection pins at the start of configuration time determine
the method to be used. See Table 1. The data may be
either bit-serial or byte-parallel, depending on the configu-
ration mode. The different LCA devices have different
sizes and numbers of data frames. To maintain compatibil-
ity between various device types, the Xilinx product fami-
lies use compatible configuration formats. For the
XC3020, configuration requires 14779 bits for each de-
vice, arranged in 197 data frames. An additional 40 bits are
used in the header. See Figure 20. The specific data
format for each device is produced by the MakeBits
command of the development system and one or more of
these files can then be combined and appended to a length
count preamble and be transformed into a PROM format
file by the MakePROM command of the XACT develop-
ment system. A compatibility exception precludes the use
of an XC2000-series device as the master for XC3000-
series devices if their DONE or RESET are programmed
to occur after their outputs become active.
The Tie Option of the MakeBits program defines output
levels of unused blocks of a design and connects these to
unused routing resources. This prevents indeterminate
levels that might produce parasitic supply currents. If
unused blocks are not sufficient to complete the tie, the
Flagnet command of EDITLCA can be used to indicate
nets which must not be used to drive the remaining unused
routing, as that might affect timing of user nets. Norestore
will retain the results of tie for timing analysis with Querynet
before Restore returns the design to the untied condition.
Tie can be omitted for quick breadboard iterations where
a few additional milliamps of ICC are acceptable.
The configuration bitstream begins with eight High pre-
amble bits, a 4-bit preamble code and a 24-bit length count.
When configuration is initiated, a counter in the LCA device
is set to zero and begins to count the total number of
configuration clock cycles applied to the device. As each
configuration data frame is supplied to the LCA device, it is
internally assembled into a data word, which is then loaded
in parallel into one word of the internal configuration
memory array. The configuration loading process is com-
plete when the current length count equals the loaded
length count and the required configuration program data
frames have been written. Internal user flip-flops are held
Reset during configuration.
Two user-programmable pins are defined in the unconfig-
ured Logic Cell array. High During Configuration (HDC)
and Low During Configuration (LDC) as well as
DONE/PROG may be used as external control signals
during configuration. In Master mode configurations it is
convenient to use LDC as an active-Low EPROM Chip
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-122
Daisy Chain
The XACT development system is used to create a com-
posite configuration for selected LCA devices including: a
preamble, a length count for the total bitstream, multiple
concatenated data programs and a postamble plus an
additional fill bit per device in the serial chain. After loading
and passing-on the preamble and length count to a pos-
sible daisy-chain, a lead device will load its configuration
data frames while providing a High DOUT to possible
down-stream devices as shown in Figure 22. Loading
continues while the lead device has received its configura-
tion program and the current length count has not reached
the full value. The additional data is passed through the
lead device and appears on the Data Out (DOUT) pin in
serial form. The lead device also generates the Configura-
tion Clock (CCLK) to synchronize the serial output data
and data in of down-stream LCA devices. Data is read in
on DIN of slave devices by the positive edge of CCLK
and shifted out the DOUT on the negative edge of CCLK.
A parallel Master mode device uses its internal timing
generator to produce an internal CCLK of 8 times its
EPROM address rate, while a Peripheral mode device
produces a burst of 8 CCLKs for each chip select and write-
strobe cycle. The internal timing generator continues to
operate for general timing and synchronization of inputs in
all modes.
Special Configuration Functions
The configuration data includes control over several spe-
cial functions in addition to the normal user logic functions
and interconnect.
• Input thresholds
• Readback disable
• DONE pull-up resistor
• DONE timing
• RESET timing
• Oscillator frequency divided by two
Each of these functions is controlled by configuration data
bits which are selected as part of the normal XACT
development system bitstream generation process.
Input Thresholds
Prior to the completion of configuration all LCA device
input thresholds are TTL compatible. Upon completion of
configuration, the input thresholds become either TTL or
CMOS compatible as programmed. The use of the TTL
threshold option requires some additional supply current
for threshold shifting. The exception is the threshold of the
PWRDWN input and direct clocks which always have a
CMOS input. Prior to the completion of configuration the
user I/O pins each have a high impedance pull-up. The
Enable. After the last configuration data bit is loaded and
the length count compares, the user I/O pins become
active. Options in the MakeBits program allow timing
choices of one clock earlier or later for the timing of the end
of the internal logic RESET and the assertion of the DONE
signal. The open-drain DONE/PROG output can be AND-
tied with multiple LCA devices and used as an active-High
READY, an active-Low PROM enable or a RESET to other
portions of the system. The state diagram of Figure 18
illustrates the configuration process.
Master Mode
In Master mode, the LCA device automatically loads
configuration data from an external memory device. There
are three Master modes that use the internal timing source
to supply the configuration clock (CCLK) to time the
incoming data. Master Serial mode uses serial configura-
tion data supplied to Data-in (DIN) from a synchronous
serial source such as the Xilinx Serial Configuration PROM
shown in Figure 21. Master Parallel Low and High modes
automatically use parallel data supplied to the D0–D7 pins
in response to the 16-bit address generated by the LCA
device. Figure 22 shows an example of the parallel Master
mode connections required. The LCA HEX starting ad-
dress is 0000 and increments for Master Low mode and it
is FFFF and decrements for Master High mode. These two
modes provide address compatibility with microproces-
sors which begin execution from opposite ends of memory.
Peripheral Mode
Peripheral mode provides a simplified interface through
which the device may be loaded byte-wide, as a processor
peripheral. Figure 23 shows the peripheral mode connec-
tions. Processor write cycles are decoded from the com-
mon assertion of the active low Write Strobe (WS), and two
active low and one active high Chip Selects (CS0, CS1,
CS2). The LCA device generates a configuration clock
from the internal timing generator and serializes the paral-
lel input data for internal framing or for succeeding slaves
on Data Out (DOUT). A output High on READY/BUSY pin
indicates the completion of loading for each byte when the
input register is ready for a new byte. As with Master
modes, Peripheral mode may also be used as a lead
device for a daisy-chain of slave devices.
Slave Serial Mode
Slave Serial mode provides a simple interface for loading
the Logic Cell Array configuration as shown in Figure 24.
Serial data is supplied in conjunction with a synchronizing
input clock. Most Slave mode applications are in daisy-
chain configurations in which the data input is driven from
the previous Logic Cell Array’s data out, while the clock is
supplied by a lead device in Master or Peripheral mode.
Data may also be supplied by a processor or other special
circuits.
2-123
configuration program can be used to enable the IOB pull-
up resistors in the Operational mode to act either as an
input load or to avoid a floating input on an otherwise
unused pin.
Readback
The contents of a Logic Cell Array may be read back if it
has been programmed with a bitstream in which the
Readback option has been enabled. Readback may be
used for verification of configuration and as a method of
determining the state of internal logic nodes during debug-
ging. There are three options in generating the configura-
tion bitstream.
• “Never” inhibits the Readback capability.
• “One-time,” inhibits Readback after one Readback
has been executed to verify the configuration.
• “On-command” allows unrestricted use of Readback.
Readback is accomplished without the use of any of the
user I/O pins; only M0, M1 and CCLK are used. The
initiation of Readback is produced by a Low to High
transition of the M0/RTRIG (Read Trigger) pin. The CCLK
input must then be driven by external logic to read back the
configuration data. The first three Low-to-High CCLK
transitions clock out dummy data. The subsequent Low-
to-High CCLK transitions shift the data frame information
out on the M1/RDATA (Read Data) pin. Note that the logic
polarity is always inverted, a zero in configuration be-
comes a one in Readback, and vice versa. Note also that
each Readback frame has one Start bit (read back as a
one) but, unlike in configuration, each Readback frame
has only one Stop bit (read back as a zero). The third
leading dummy bit mentioned above can be considered
the Start bit of the first frame. All data frames must be read
back to complete the process and return the Mode Select
and CCLK pins to their normal functions.
Readback data includes the current state of each CLB
flip-flop, each input flip-flop or latch, and each device pad.
These data are imbedded into unused configuration bit
positions during Readback. This state information is used
by the XACT development system In-Circuit Verifier to
provide visibility into the internal operation of the logic
while the system is operating. To readback a uniform time-
sample of all storage elements, it may be necessary to
inhibit the system clock.
Reprogram
To initiate a re-programming cycle, the dual-function pin
DONE/PROG must be given a High-to-Low transition. To
reduce sensitivity to noise, the input signal is filtered for two
cycles of the LCA device internal timing generator. When
reprogram begins, the user-programmable I/O output buff-
ers are disabled and high-impedance pull-ups are pro-
vided for the package pins. The device returns to the Clear
state and clears the configuration memory before it indi-
cates ‘initialized’. Since this Clear operation uses chip-
individual internal timing, the master might complete the
Clear operation and then start configuration before the
slave has completed the Clear operation. To avoid this
problem, the slave INIT pins must be AND-wired and used
to force a RESET on the master (see Figure 22). Repro-
gram control is often implemented using an external open-
collector driver which pulls DONE/PROG Low. Once a
stable request is recognized, the DONE/PROG pin is held
Low until the new configuration has been completed. Even
if the re-program request is externally held Low beyond the
configuration period, the LCA device will begin operation
upon completion of configuration.
DONE Pull-up
DONE/PROG is an open-drain I/O pin that indicates the
LCA device is in the operational state. An optional internal
pull-up resistor can be enabled by the user of the XACT
development system when MAKEBITS is executed. The
DONE/PROG pins of multiple LCA devices in a daisy-
chain may be connected together to indicate all are DONE
or to direct them all to reprogram.
DONE Timing
The timing of the DONE status signal can be controlled by
a selection in the MakeBits program to occur either a CCLK
cycle before, or after, the outputs going active. See Figure
20. This facilitates control of external functions such as a
PROM enable or holding a system in a wait state.
RESET Timing
As with DONE timing, the timing of the release of the
internal reset can be controlled by a selection in the
MakeBits program to occur either a CCLK cycle before, or
after, the outputs going active. See Figure 20. This reset
keeps all user programmable flip-flops and latches in a
zero state during configuration.
Crystal Oscillator Division
A selection in the MakeBits program allows the user to
incorporate a dedicated divide-by-two flip-flop between
the crystal oscillator and the alternate clock line. This
guarantees a symmetrical clock signal. Although the fre-
quency stability of a crystal oscillator is very good, the
symmetry of its waveform can be affected by bias or
feedback drive.
The following seven pages describe the different configuration modes in detail
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-124
Master Serial Mode
Figure 21. Master Serial Mode
In Master Serial mode, the CCLK output of the lead LCA
device drives a Xilinx Serial PROM that feeds the LCA DIN
input. Each rising edge of the CCLK output increments the
Serial PROM internal address counter. This puts the next
data bit on the SPROM data output, connected to the LCA
DIN pin. The lead LCA device accepts this data on the
subsequent rising CCLK edge.
The lead LCA device then presents the preamble data
(and all data that overflows the lead device) on its DOUT
pin. There is an internal delay of 1.5 CCLK periods, which
means that DOUT changes on the falling CCLK edge, and
the next LCA device in the daisy-chain accepts data on the
subsequent rising CCLK edge.
The SPROM CE input can be driven from either LDC or
DONE . Using LDC avoids potential contention on the DIN
pin, if this pin is configured as user-I/O, but LDC is then
restricted to be a permanently High user output. Using
DONE also avoids contention on DIN, provided the early
DONE option is invoked.
X6092
CE
GENERAL-
PURPOSE
USER I/O
PINS
M0 M1 PWRDWN
DOUT
M2
HDC
OTHER
I/O PINS
RESET
DIN
CCLK
DATA
CLK
+5 V
•
•
•
•
•
OE/RESET
XC3000
LCA
DEVICE
D/P
SCP
CEO
CASCADED
SERIAL
MEMORY
LDC
INIT
XC17xx
RESET
SLAVE LCAs WITH IDENTICAL
CONFIGURATIONS
DURING CONFIGURATION
THE 5 kΩ M2 PULL-DOWN
RESISTOR OVERCOMES THE
INTERNAL PULL-UP,
BUT IT ALLOWS M2 TO
BE USER I/O.
(LOW RESETS THE XC17xx ADDRESS POINTER)
TO CCLK OF OPTIONAL
VCC VPP
+5 V
DAISY-CHAINED LCAs WITH
DIFFERENT CONFIGURATIONS
TO DIN OF OPTIONAL
IF READBACK IS
ACTIVATED, A
5-kΩ RESISTOR IS
REQUIRED IN
SERIES WITH M1
**
CE
DATA
CLK
OE/RESET
DAISY-CHAINED LCAs WITH
DIFFERENT CONFIGURATIONS
TO CCLK OF OPTIONAL
SLAVE LCAs WITH IDENTICAL
CONFIGURATIONS
TO DIN OF OPTIONAL
INIT
2-125
Serial Data In
CCLK
(Output)
Serial DOUT
(Output)
1T
DSCK
2T
CKDS
n n + 1 n + 2
n – 3 n – 2 n – 1 n
X3223
Master Serial Mode Programming Switching Characteristics
Speed Grade Min Max Units
Description Symbol
CCLK Data In setup 1 TDSCK 60 ns
Data In hold 2 CKDS 0ns
Notes: 1. At power-up, VCC must rise from 2.0 V to VCC min in less than 25 ms. If this is not possible, configuration can be
delayed by holding RESET Low until VCC has reached 4.0 V (2.5 V for the XC3000L). A very long VCC rise time of
>100 ms, or a non-monotonically rising VCC may require >6-µs High level on RESET, followed by a >6-µs Low
level on RESET and D/P after VCC has reached 4.0 V (2.5 V for the XC3000L).
2. Configuration can be controlled by holding RESET Low with or until after the INIT of all daisy-chain slave-mode
devices is High.
3. Master-serial-mode timing is based on slave-mode testing.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-126
Master Parallel Mode
Figure 22. Master Parallel Mode
X3159
RCLK
General-
Purpose
User I/O
Pins
M0 M1PWRDWN
M2
HDC
Other
I/O Pins
D7
D6
D5
D4
D3
D2
D1
D0
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
+5 V
.....
CE
OE
LCA
CCLK
DOUT
System Reset
A11
A12
A13
A14
A15
EPROM
RESET
...
Other
I/O Pins
DOUT
M2
HDC
LDC
LCA
Slave #1
+5 V
M0 M1PWRDWN
CCLK
DIN
D/P
Reset
DOUT
LCA
Slave #n
+5 V
M0 M1PWRDWN
CCLK
DIN
D/P
General-
Purpose
User I/O
Pins
RESET
Master
...
+5 V
8
INIT
...
M2
HDC
LDC
INIT
General-
Purpose
User I/O
Pins
+5 V
D/P
Other
I/O Pins
Note: XC2000 Devices Do Not
Have INIT to Hold Off a Master
Device. Reset of a Master Device
Should be Asserted by an External
Timing Circuit to Allow for LCA CCLK
Variations in Clear State Time.
Open
Collector
INIT N.C.
Reprogram
5 kΩ 5 kΩ 5 kΩ
5 kΩ Each
If Readback is
Activated, a
5-kΩ Resistor is
Required in
Series With M1
****
internal delay of 1.5 CCLK periods, after the rising CCLK
edge that accepts a byte of data, and also changes the
EPROM address, until the falling CCLK edge that makes
the LSB (D0) of this byte appear at DOUT. This means that
DOUT changes on the falling CCLK edge, and the next
LCA device in the daisy chain accepts data on the subse-
quent rising CCLK edge.
In Master Parallel mode, the lead LCA device directly
addresses an industry-standard byte-wide EPROM and
accepts eight data bits right before incrementing (or
decrementing) the address outputs.
The eight data bits are serialized in the lead LCA device,
which then presents the preamble data (and all data that
overflows the lead device) on the DOUT pin. There is an
2-127
Master Parallel Mode Programming Switching Characteristics
Description Symbol Min Max Units
RCLK To address valid 1 TRAC 0 200 ns
To data setup 2 TDRC 60 ns
To data hold 3 TRCD 0ns
RCLK High TRCH 600 ns
RCLK Low TRCL 4.0 µs
Notes: 1. At power-up, VCC must rise from 2.0 V to VCC min in less than 25 ms. If this is not possible, configuration can be
delayed by holding RESET Low until VCC has reached 4.0 V (2.5 V for the XC3000L). A very long VCC rise time of
>100 ms, or a non-monotonically rising VCC may require a >6-µs High level on RESET, followed by a >6-µs Low
level on RESET and D/P after VCC has reached 4.0 V (2.5 V for the XC3000L).
2. Configuration can be controlled by holding RESET Low with or until after the INIT of all daisy-chain slave-mode
devices is High.
This timing diagram shows that the EPROM requirements are extremely relaxed:
EPROM access time can be longer than 4000 ns. EPROM data output has no hold time requirements.
Address for Byte n
Byte
2T
DRC
Address for Byte n + 1
D7D6
A0-A15
(output)
D0-D7
RCLK
(output)
CCLK
(output)
DOUT
(output)
1T
RAC
7 CCLKs CCLK
3T
RCD
Byte n - 1
X5380
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-128
Peripheral Mode
X3031
ADDRESS
BUS DATA
BUS
D0–7
ADDRESS
DECODE
LOGIC CS0
...
RDY/BUSY
WS
RESET
...
OTHER
I/O PINS
D0–7 CCLK
DOUT
M2
HDC
LDC
LCA GENERAL-
PURPOSE
USER I/O
PINS
D/P
M0 M1 PWR
DWN
+5 V
CS2
CS1
CONTROL
SIGNALS
8
INIT
REPROGRAM
+5 V
5 kΩ
* IF READBACK IS
ACTIVATED, A
5-kΩ RESISTOR IS
REQUIRED IN SERIES
WITH M1
*
OPTIONAL
DAISY-CHAINED
LCAs WITH DIFFERENT
CONFIGURATIONS
OC
Figure 23. Peripheral Mode.
Peripheral mode uses the trailing edge of the logic AND
condition of the CS0, CS1, CS2, and WS inputs to accept
byte-wide data from a microprocessor bus. In the lead LCA
device, this data is loaded into a double-buffered UART-
like parallel-to-serial converter and is serially shifted into
the internal logic. The lead LCA device presents the
preamble data (and all data that overflows the lead device)
on the DOUT pin.
The Ready/Busy output from the lead LCA device acts as
a handshake signal to the microprocessor. RDY/BUSY
goes Low when a byte has been received, and goes High
again when the byte-wide input buffer has transferred its
information into the shift register, and the buffer is ready to
receive new data. The length of the BUSY signal depends
on the activity in the UART. If the shift register had been
empty when the new byte was received, the BUSY signal
lasts for only two CCLK periods. If the shift register was still
full when the new byte was received, the BUSY signal can
be as long as nine CCLK periods.
Note that after the last byte has been entered, only seven
of its bits are shifted out. CCLK remains High with DOUT
equal to bit 6 (the next-to-last bit) of the last byte entered.
2-129
Peripheral Mode Programming Switching Characteristics
6
BUSY
T
D6DOUT
RDY/BUSY
D7 D0 D1 D2
4
WTRB
T
Valid
2
DC
T
1
CA
T
CCLK
D0-D7
CS2
WS, CS0, CS1
3
CD
T
WRITE TO LCA
X3249
Previous Byte New Byte
This timing diagram shows very relaxed requirements: Data need not be held beyond the rising edge of WS. BUSY will
go active within 60 ns after the end of WS. BUSY will stay active for several microseconds. WS may be asserted immedi-
ately after the end of BUSY.
Periods
Description Symbol Min Max Units
Write Effective Write time required 1 TCA 100 ns
(Assertion of CS0, CS1, CS2, WS)
DIN Setup time required 2 TDC 60 ns
DIN Hold time required 3 TCD 0ns
RDY/BUSY delay after end of WS 4 TWTRB 60 ns
RDY Earliest next WS after end of BUSY 5 TRBWT 0ns
BUSY Low time generated 6 TBUSY 2.5 9 CCLK
Notes: 1. At power-up, VCC must rise from 2.0 V to VCC min in less than 25 ms. If this is not possible, configuration can be
delayed by holding RESET Low until VCC has reached 4.0 V (2.5 V for the XC3000L). A very long VCC rise time of
>100 ms, or a non-monotonically rising VCC may require a >6-µs High level on RESET, followed by a >6-µs Low level
on RESET and D/P after VCC has reached 4.0 V (2.5 V for the XC3000L).
2. Configuration must be delayed until the INIT of all LCAs is High.
3. Time from end of WS to CCLK cycle for the new byte of data depends on completion of previous byte processing and
the phase of the internal timing generator for CCLK.
4. CCLK and DOUT timing is tested in slave mode.
5. TBUSY indicates that the double-buffered parallel-to-serial converter is not yet ready to receive new data. The shortest
TBUSY occurs when a byte is loaded into an empty parallel-to-serial converter. The longest TBUSY occurs when a new
word is loaded into the input register before the second-level buffer has started shifting out data.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-130
Slave Serial Mode
In Slave Serial mode, an external signal drives the CCLK
input(s) of the LCA device(s). The serial configuration
bitstream must be available at the DIN input of the lead
LCA device a short set-up time before each rising CCLK
edge. The lead LCA device then presents the preamble
data (and all data that overflows the lead device) on its
DOUT pin. There is an internal delay of 0.5 CCLK periods,
which means that DOUT changes on the falling CCLK
edge, and the next LCA device in the daisy-chain accepts
data on the subsequent rising CCLK edge.
Figure 24. Slave Serial Mode.
D/P
RESET
X3157
LCA
General-
Purpose
User I/O
Pins
+5 V
M0 M1 PWRDWN
CCLK
DIN
STRB
D0
D1
D2
D3
D4
D5
D6
D7
RESET
I/O
Port
Micro
Computer
DOUT
HDC
LDC
M2
...
Other
I/O Pins
INIT
+5 V
5 kΩ
If Readback is
Activated, a
5-kΩ Resistor is
Required in
Series with M1
*
Optional
Daisy-Chained
LCAs with
Different
Configurations
*
2-131
Program Readback Switching Characteristics
Description Symbol Min Max Units
CCLK To DOUT 3 TCCO 100 ns
DIN setup 1 TDCC 60 ns
DIN hold 2 TCCD 0ns
High time 4 TCCH 0.05 µs
Low time (Note 1) 5 TCCL 0.05 5.0 µs
Frequency FCC 10 MHz
Slave Serial Mode Programming Switching Characteristics
Notes: 1. The max limit of CCLK Low time is caused by dynamic circuitry inside the LCA device.
2. Configuration must be delayed until the INIT of all LCA devices is High.
3. At power-up, VCC must rise from 2.0 V to VCC min in less than 25 ms. If this is not possible, configuration can be de-
layed by holding RESET Low until VCC has reached 4.0 V (2.5 V for the XC3000L). A very long VCC rise time of >100
ms, or a non-monotonically rising VCC may require a >6-µs High level on RESET, followed by a >6-µs Low level on
RESET and D/P after VCC has reached 4.0 V (2.5 V for the XC3000L).
Description Symbol Min Max Units
RTRIG RTRIG High 1 TRTH 250 ns
CCLK RTRIG setup 2 TRTCC 200 ns
RDATA delay 3 TCCRD 100 ns
High time 5 TCCHR 0.5 µs
Low time 4 TCCLR 0.5 5 µs
Notes: 1. During Readback, CCLK frequency may not exceed 1 MHz.
2. RETRIG (M0 positive transition) shall not be done until after one clock following active I/O pins.
3. Readback should not be initiated until configuration is complete.
4. TCCLR is 5 µs min to 15 µs max for XC3000L.
4T
CCH
Bit n Bit n + 1
Bit nBit n - 1
3T
CCO
5T
CCL
2T
CCD
1T
DCC
DIN
CCLK
DOUT
(Output)
X5379
1TRTH
5
3
4
4
2
TCCL
TCCRD
TCCL
TRTCC
DONE/PROG
(OUTPUT)
X6116
RTRIG (M0)
CCLK(1)
VALID
READBACK OUTPUT
H1-Z VALID
READBACK OUTPUT
M1 Input/
RDATA Output
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-132
General LCA Switching Characteristics
Description Symbol Min Max Units
RESET (2) M0, M1, M2 setup time required 2 TMR 1 µs
M0, M1, M2 hold time required 3 TRM 3µs
RESET Width (Low) req. for Abort 4 TMRW 6µs
DONE/PROG Width (Low) required for Re-config. 5 TPGW 6µs
INIT response after D/P is pulled Low 6 TPGI 7µs
PWRDWN (3) Power Down VCC VCCPD 2.3 V
Notes: 1. At power-up, Vcc must rise from 2.0 V to VCC min in less than 25 ms. If this is not possible, configuration can be de-
layed by holding RESET Low until Vcc has reached 4.0 V (2.5 V for XC3000L). A very long Vcc rise time of >100 ms, or
a non-monotonically rising Vcc may require a >1-µs High level on RESET, followed by a >6-µs Low level on RESET and
D/P after Vcc has reached 4.0 V (2.5 V for XC3000L).
2. RESET timing relative to valid mode lines (M0, M1, M2) is relevant when RESET is used to delay configuration. The
specified hold time is caused by a shift-register filter slowing down the response to RESET during configuration.
3. PWRDWN transitions must occur while Vcc >4.0 V(2.5 V for XC3000L).
4 TMRW
2 TMR 3 TRM
5 TPGW
6 TPGI
Clear State Configuration StateUser State
Note 3
VCCPD X5387
RESET
M0/M1/M2
DONE/PROG
INIT
(Output)
PWRDWN
VCC (Valid)
2-133
Performance
Device Performance
The XC3000 families of FPGAs can achieve very high
performance. This is the result of
• A sub-micron manufacturing process, developed and
continuously being enhanced for the production of
state-of-the-art CMOS SRAMs.
• Careful optimization of transistor geometries, circuit
design, and lay-out, based on years of experience
with the XC3000 family.
• A look-up table based, coarse-grained architecture
that can collapse multiple-layer combinatorial logic
into a single function generator. One CLB canimple-
ment up to four layers of conventional logic in as little
as 2.7 ns.
Actual system performance is determined by the timing of
critical paths, including the delay through the combinato-
rial and sequential logic elements within CLBs and IOBs,
plus the delay in the interconnect routing. The ac-timing
specifications state the worst-case timing parameters for
the various logic resources available in the XC3000-
families architecture. Figure 25 shows a variety of ele-
ments involved in determining system performance.
Logic block performance is expressed as the propagation
time from the interconnect point at the input to the block to
the output of the block in the interconnect area. Since
combinatorial logic is implemented with a memory lookup
table within a CLB, the combinatorial delay through the
CLB, called TILO, is always the same, regardless of the
function being implemented. For the combinatorial logic
function driving the data input of the storage element, the
critical timing is data set-up relative to the clock edge
provided to the flip-flop element. The delay from the clock
source to the output of the logic block is critical in the timing
signals produced by storage elements. Loading of a logic-
block output is limited only by the resulting propagation
delay of the larger interconnect network. Speed perfor-
mance of the logic block is a function of supply voltage and
temperature. See Figure 26.
Interconnect performance depends on the routing re-
sources used to implement the signal path. Direct inter-
connects to the neighboring CLB provide an extremely fast
path. Local interconnects go through switch matrices
(magic boxes) and suffer an RC delay, equal to the
resistance of the pass transistor multiplied by the capaci-
tance of the driven metal line. Longlines carry the signal
across the length or breadth of the chip with only one
access delay. Generous on-chip signal buffering makes
performance relatively insensitive to signal fan-out; in-
creasing fan-out from 1 to 8 changes the CLB delay by only
10%. Clocks can be distributed with two low-skew clock
distribution networks.
The tools in the XACT Development System used to place
and route a design in an XC3000 FPGA (the Automatic
Place and Route [APR] program and the XACT Design
Editor)automatically calculate the actual maximum worst-
case delays along each signal path. This timing informa-
tion can be back-annotated to the design’s netlist for use
in timing simulation or examined with X-DELAY, a static
timing analyzer.
Actual system performance is applications dependent.
The maximum clock rate that can be used in a system is
determined by the critical path delays within that system.
These delays are combinations of incremental logic and
routing delays, and vary from design to design. In a
synchronous system, the maximum clock rate depends on
the number of combinatorial logic layers between re-
synchronizing flip-flops. Figure 27 shows the achievable
clock rate as a function of the number of CLB layers.
Figure 25. Primary Block Speed Factors. Actual timing is a function of various block factors combined with routing
factors. Overall performance can be evaluated with the XACT timing calculator or by an optional simulation.
CLBCLB IOBCLB
PAD
(K)
LogicLogic
CKO
T
CLOCK
Clock to Output Combinatorial Setup
TCKO TILO TICK
(K)
PAD
IOB
TPID TOKPO
OP
T
X3178
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-134
Figure 26. Relative Delay as a Function of Temperature, Supply Voltage and Processing Variations
Power
Power Distribution
Power for the LCA device is distributed through a grid to
achieve high noise immunity and isolation between logic
and I/O. Inside the LCA device, a dedicated VCC and
ground ring surrounding the logic array provides power to
the I/O drivers. An independent matrix of VCC and
groundlines supplies the interior logic of the device. This
power distribution grid provides a stable supply and ground
for all internal logic, providing the external package power
pins are all connected and appropriately decoupled. Typi-
cally a 0.1-µF capacitor connected near the VCC and
ground pins will provide adequate decoupling.
Output buffers capable of driving the specified 4- or 8-mA
loads under worst-case conditions may be capable of
driving as much as 25 to 30 times that current in a best
case. Noise can be reduced by minimizing external load
capacitance and reducing simultaneous output transitions
in the same direction. It may also be beneficial to locate
heavily loaded output buffers near the ground pads. The
I/O Block output buffers have a slew-limited mode which
should be used where output rise and fall times are not
speed critical. Slew-limited outputs maintain their dc drive
capability, but generate less external reflections and inter-
nal noise.
System Clock (MHz)
250
200
150
100
50
3 CLBs
(3-12)
4 CLBs
(4-16) 2 CLBs
(2-8) 1 CLB
(1-4)
XC3100-3
XC3000-125
CLB Levels:
Gate Levels:
300
Toggle
Rate
0
X3250
Figure 27. Clock Rate as a Function of Logic Complexity
(Number of Combinational Levels between
Flip-Flops)
1.00
0.80
0.60
0.40
0.20
SPECIFIED WORST-CASE VALUES
MAX COMMERCIAL (4.75 V)
MAX MILITARY (4.5 V)
– 55
MIN MILITARY (5.5 V)
MIN COMMERCIAL (4.75 V)
MIN COMMERCIAL (5.25 V)
TYPICAL COMMERCIAL
(+ 5.0 V, 25°C)
TYPICAL MILITARY
TEMPERATURE (°C)
– 40 – 20 0 25 40 70 80 100 125
NORMALIZED DELAY
X6094
MIN MILITARY (4.5 V)
2-135
Dynamic Power Consumption
XC3042 XC3042A XC3042L XC3142A
One CLB driving three local interconnects 0.25 0.17 0.07 0.25 mW per MHz
One global clock buffer and clock line 2.25 1.40 0.50 1.70 mW per MHz
One device output with a 50 pF load 1.25 1.25 0.55 1.25 mW per MHz
Power Consumption
The Logic Cell Array exhibits the low power consumption
characteristic of CMOS ICs. For any design, the configu-
ration option of TTL chip input threshold requires power for
the threshold reference. The power required by the static
memory cells that hold the configuration data is very low
and may be maintained in a power-down mode.
Typically, most of power dissipation is produced by exter-
nal capacitive loads on the output buffers. This load and
frequency dependent power is 25 µW/pF/MHz per output.
Another component of I/O power is the external dc loading
on all output pins.
Internal power dissipation is a function of the number and
size of the nodes, and the frequency at which they change.
In an LCA device, the fraction of nodes changing on a
given clock is typically low (10-20%). For example, in a
long binary counter, the total activity of all counter flip-flops
is equivalent to that of only two CLB outputs toggling at the
clock frequency. Typical global clock-buffer power is be-
tween 2.0 mW/MHz for the XC3020 and 3.5 mW/MHz for
the XC3090. The internal capacitive load is more a func-
tion of interconnect than fan-out. With a typical load of
three general interconnect segments, each CLB output
requires about 0.25 mW per MHz of its output frequency.
Because the control storage of the Logic Cell Array is
CMOS static memory, its cells require a very low standby
current for data retention. In some systems, this low data
retention current characteristic can be used as a method
of preserving configurations in the event of a primary
power loss. The Logic Cell Array has built in Powerdown
logic which, when activated, will disable normal operation
of the device and retain only the configuration data. All
internal operation is suspended and output buffers are
placed in their high-impedance state with no pull-ups.
Different from the XC3000 family which can be powered
down to a current consumption of a few microamps, the
XC3100 draws 5 mA, even in power-down. This makes
power-down operation less meaningful. In contrast, ICCPD
for the XC3000L is only 10 µA.
To force the Logic Cell Array into the Powerdown state, the
user must pull the PWRDWN pin Low and continue to
supply a retention voltage to the VCC pins. When normal
power is restored, VCC is elevated to its normal operating
voltage and PWRDWN is returned to a High. The Logic
Cell Array resumes operation with the same internal se-
quence that occurs at the conclusion of configuration.
Internal-I/O and logic-block storage elements will be reset,
the outputs will become enabled and the DONE/PROG
pin will be released.
When VCC is shut down or disconnected, some power
might unintentionally be supplied from an incoming signal
driving an I/O pin. The conventional electrostatic input
protection is implemented with diodes to the supply and
ground. A positive voltage applied to an input (or output)
will cause the positive protection diode to conduct and
drive the VCC connection. This condition can produce
invalid power conditions and should be avoided. A large
series resistor might be used to limit the current or a bipolar
buffer may be used to isolate the input signal.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-136
Pin Descriptions
Permanently Dedicated Pins.
VCC
Two to eight (depending on package type) connections to
the positive V supply voltage. All must be connected.
GND
Two to eight (depending on package type) connections to
ground. All must be connected.
PWRDWN
A Low on this CMOS-compatible input stops all internal
activity, but retains configuration. All flip-flops and latches
are reset, all outputs are 3-stated, and all inputs are
interpreted as High, independent of their actual level.
When PWDWN returns High, the LCA device becomes
operational with DONE Low for two cycles of the internal
1-MHz clock.Before and during configuration, PWRDWN
must be High. If not used, PWRDWN must be tied to V CC.
RESET
This is an active Low input which has three functions.
Prior to the start of configuration, a Low input will delay the
start of the configuration process. An internal circuit
senses the application of power and begins a minimal
time-out cycle. When the time-out and RESET are com-
plete, the levels of the M lines are sampled and configura-
tion begins.
If RESET is asserted during a configuration, the LCA
device is re-initialized and restarts the configuration at the
termination of RESET.
If RESET is asserted after configuration is complete, it
provides a global asynchronous RESET of all IOB and
CLB storage elements of the LCA device.
CCLK
During configuration, Configuration Clock is an output of
an LCA device in Master mode or Peripheral mode, but an
input in Slave mode. During Readback, CCLK is a clock
input for shifting configuration data out of the LCA device
CCLK drives dynamic circuitry inside the LCA device. The
Low time may, therefore, not exceed a few microseconds.
When used as an input, CCLK must be “parked High”. An
internal pull-up resistor maintains High when the pin is not
being driven.
DONE/PROG (D/P)
DONE is an open-drain output, configurable with or without
an internal pull-up resistor of 2 to 8 k Ω. At the completion of
configuration, the LCA device circuitry becomes active in a
synchronous order; DONE is programmed to go active High
one cycle either before or after the outputs go active.
Once configuration is done, a High-to-Low transition of this
pin will cause an initialization of the LCA device and start
a reconfiguration.
M0/RTRIG
As Mode 0, this input is sampled on power-on to determine
the power-on delay (214 cycles if M0 is High, 216 cycles if
M0 is Low). Before the start of configuration, this input is
again sampled together with M1, M2 to determine the
configuration mode to be used .
A Low-to-High input transition, after configuration is com-
plete, acts as a Read Trigger and initiates a Readback of
configuration and storage-element data clocked by CCLK.
By selecting the appropriate Readback option when gen-
erating the bitstream, this operation may be limited to a
single Readback, or be inhibited altogether.
M1/RDATA
As Mode 1, this input and M0, M2 are sampled before the
start of configuration to establish the configuration mode to
be used. If Readback is never used, M1 can be tied directly
to ground or VCC. If Readback is ever used, M1 must use
a 5-kΩ resistor to ground or VCC, to accommodate the
RDATA output.
As an active-Low Read Data, after configuration is com-
plete, this pin is the output of the Readback data.
2-137
User I/O Pins that can have special functions.
M2
During configuration, this input has a weak pull-up resistor.
Together with M0 and M1, it is sampled before the start of
configuration to establish the configuration mode to be
used. After configuration, this pin is a user-programmable
I/O pin.
HDC
During configuration, this output is held at a High level to
indicate that configuration is not yet complete. After con-
figuration, this pin is a user-programmable I/O pin.
LDC
During Configuration, this output is held at a Low level to
indicate that the configuration is not yet complete. After
configuration, this pin is a user-programmable I/O pin.
LDC is particularly useful in Master mode as a Low enable
for an EPROM, but it must then be programmed as a High
after configuration.
INIT
This is an active Low open-drain output with a weak pull-
up and is held Low during the power stabilization and
internal clearing of the configuration memory. It can be
used to indicate status to a configuring microprocessor or,
as a wired AND of several slave mode devices, a hold-off
signal for a master mode device. After configuration this
pin becomes a user-programmable I/O pin.
BCLKIN
This is a direct CMOS level input to the alternate clock
buffer (Auxiliary Buffer) in the lower right corner.
XTL1
This user I/O pin can be used to operate as the output of
an amplifier driving an external crystal and bias circuitry.
XTL2
This user I/O pin can be used as the input of an amplifier
connected to an external crystal and bias circuitry. The I/
O Block is left unconfigured. The oscillator configuration is
activated by routing a net from the oscillator buffer symbol
output and by the MakeBits program.
CS0, CS1, CS2, WS
These four inputs represent a set of signals, three active
Low and one active High, that are used to control configu-
ration-data entry in the Peripheral mode. Simultaneous
assertion of all four inputs generates a Write to the internal
data buffer. The removal of any assertion clocks in the D0-
D7 data. In Master-Parallel mode, WS and CS2 are the A0
and A1 outputs. After configuration, these pins are user-
programmable I/O pins.
RDY/BUSY
During Peripheral Parallel mode configuration this pin
indicates when the chip is ready for another byte of data to
be written to it. After configuration is complete, this pin
becomes a user-programmed I/O pin.
RCLK
During Master Parallel mode configuration, each change
on the A0-15 outputs is preceded by a rising edge on
RCLK, a redundant output signal. After configuration is
complete, this pin becomes a user-programmed I/O pin.
D0-D7
This set of eight pins represents the parallel configuration
byte for the parallel Master and Peripheral modes. After
configuration is complete, they are user-programmed
I/O pins.
A0-A15
During Master Parallel mode, these 16 pins present an
address output for a configuration EPROM. After configu-
ration, they are user-programmable I/O pins.
DIN
During Slave or Master Serial configuration, this pin is
used as a serial-data input. In the Master or Peripheral
configuration, this is the Data 0 input. After configuration is
complete, this pin becomes a user-programmed I/O pin.
DOUT
During configuration this pin is used to output serial-
configuration data to the DIN pin of a daisy-chained slave.
After configuration is complete, this pin becomes a user-
programmed I/O pin.
TCLKIN
This is a direct CMOS-level input to the global clock buffer.
This pin can also be configured as a user programmable
I/O pin. However, since TCLKIN is the preferred input to
the global clock net, and the global clock net should be
used as the primary clock source, this pin is usually the
clock input to the chip.
Unrestricted User I/O Pins.
I/O
An I/O pin may be programmed by the user to be an Input
or an Output pin following configuration. All unrestricted I/
O pins, plus the special pins mentioned on the following
page, have a weak pull-up resistor of 50 kΩ to 100 kΩ that
becomes active as soon as the device powers up, and
stays active until the end of configuration.
Before and during configuration, all outputs that are not used for the configuration process are 3-stated with
a 50 k
Ω
to 100 k
Ω
pull-up resistor.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-138
Configuration Mode <M2:M1:M0>
SLAVE
<1:1:1> MASTER-SER
<0:0:0> PERIPHERAL
<1:0:1> MASTER-HIGH
<1:1:0> MASTER-LOW
<1:0:0>
***
44
PLCC
7
12
16
17
18
19
20
22
23
26
27
28
30
34
38
39
40
1
X
68
PLCC
10
18
25
26
27
28
30
34
35
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
1
2
3
4
5
6
7
8
9
X
X
84
PLCC
12
22
31
32
33
34
36
42
43
53
54
55
56
57
58
60
61
62
64
65
66
67
70
71
72
73
74
75
76
77
78
81
82
83
84
1
2
3
4
5
8
9
10
11
X
X
X
X**
X**
X**
84
PGA
B2
F3
J2
L1
K2
K3
L3
K6
J6
L11
K10
J10
K11
J11
H10
F10
G10
G11
F9
F11
E11
E10
D10
C11
B11
C10
A11
B10
B9
A10
A9
B6
B7
A7
C7
C6
A6
A5
B5
C5
A3
A2
B3
A1
X
X
X
100
PQFP
29
41
52
54
56
57
59
65
66
76
78
80
81
82
83
87
88
89
91
92
93
94
98
99
100
1
2
5
6
8
9
12
13
14
15
16
17
18
19
20
23
24
25
26
X
X
X
132
PGA
A1
C8
B13
A14
C13
B14
D14
G14
H12
M13
P14
N13
M12
P13
N11
M9
N9
N8
M8
N7
P6
M6
M5
N4
N2
M3
P1
M2
N1
L2
L1
K1
J2
H1
H2
H3
G2
G1
F2
E1
D1
D2
B1
C2
X
X
160
PQFP
159
20
40
42
44
45
49
59
19
76
78
80
81
82
86
92
93
98
100
102
103
108
114
115
119
120
121
124
125
128
129
132
133
136
137
139
141
142
147
148
151
152
155
156
X
X
175
PGA
B2
D9
B14
B15
C15
E14
D16
H15
J14
P15
R15
R14
N13
T14
P12
T11
R10
R9
N9
P8
R8
R7
R5
P5
R3
N4
R2
P2
M3
P1
N1
M1
L2
K2
K1
J3
H2
H1
F2
E1
D1
C1
E3
C2
X
X
User
Operation
PWRDWN (I)
VCC
RDATA
RTRIG (I)
I/O
I/O
I/O
I/O
GND
XTL2 OR I/O
RESET (I)
PROGRAM (I)
I/O
XTL1 OR I/O
I/O
I/O
I/O
I/O
Vcc
I/O
I/O
I/O
I/O
I/O
I/O
I/O
CCLK (I)
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
GND
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
All Others
XC3020 etc.
XC3030 etc.
XC3042 etc.
XC3064 etc.
XC3090 etc.
XC3195
X5266
100
TQFP
26
38
49
51
53
54
56
62
63
73
75
77
78
79
80
84
85
86
88
89
90
91
95
96
97
98
99
2
3
5
6
9
10
11
12
13
14
15
16
17
20
21
22
26
X
X
3
26
48
50
56
57
61
77
79
100
102
107
109
110
115
122
123
128
130
132
133
138
145
146
151
152
153
161
162
165
166
172
173
178
179
182
184
185
192
193
199
200
203
204
X
X
****
208
PQFP
PWRDWN (I)
VCC
M1 (LOW) (I)
M0 (LOW) (I)
M2 (LOW) (I)
HDC (HIGH)
LDC (LOW)
INIT*
GND
RESET (I)
DONE
VCC
DIN (I)
DOUT
CCLK(O)
GND
PWRDWN (I)
VCC
M1 (LOW) (I)
M0 (LOW) (I)
M2 (HIGH) (I)
HDC (HIGH)
LDC (LOW)
INIT*
GND
RESET (I)
DONE
DATA 7 (I)
DATA 6 (I)
DATA 5 (I)
DATA 4 (I)
VCC
DATA 3 (I)
DATA 2 (I)
DATA 1 (I)
RCLK
DATA 0 (I)
DOUT
CCLK(O)
A0
A1
A2
A3
A15
A4
A14
A5
GND
A13
A6
A12
A7
A11
A8
A10
A9
PWRDWN (I)
VCC
M1 (HIGH) (I)
M0 (LOW) (I)
M2 (HIGH) (I)
HDC (HIGH)
LDC (LOW)
INIT*
GND
RESET (I)
DONE
DATA 7 (I)
DATA 6 (I)
DATA 5 (I)
DATA 4 (I)
VCC
DATA 3 (I)
DATA 2 (I)
DATA 1 (I)
RCLK
DATA 0 (I)
DOUT
CCLK(O)
A0
A1
A2
A3
A15
A4
A14
A5
GND
A13
A6
A12
A7
A11
A8
A10
A9
PWRDWN (I)
VCC
M1 (LOW) (I)
M0 (HIGH) (I)
M2 (HIGH) (I)
HDC (HIGH)
LDC (LOW)
INIT*
GND
RESET (I)
DONE
DATA 7 (I)
DATA 6 (I)
DATA 5 (I)
CS0 (I)
DATA 4 (I)
VCC
DATA 3 (I)
CS1 (I)
DATA 2 (I)
DATA 1 (I)
RDY/BUSY
DATA 0 (I)
DOUT
CCLK(O)
WS (I)
CS2 (I)
GND
PWRDWN (I)
VCC
M1 (HIGH) (I)
M0 (HIGH) (I)
M2 (HIGH) (I)
HDC (HIGH)
LDC (LOW)
INIT*
GND
RESET (I)
DONE
VCC
DIN (I)
DOUT
CCLK (I)
GND
Pin Functions During Configuration
Before and during configuration, all outputs that are not used for the configuration process are 3-stated with
a 50 k
Ω
to 100 k
Ω
pull-up resistor.
Represents a 50-kΩ to 100-kΩ pull-up before and during configuration
* INIT is an open drain output during configuration
(I) Represents an input
** Pin assignmnent for the XC3064/XC3090 and XC3195 differ from those shown. See page 2-138.
*** Peripheral mode and master parallel mode are not supported in the PC44 package. See page 2-135.
**** Pin assignments for the XC3195 PQ208 differ from those shown. See page 2-146.
Pin assignments of PGA Footprint PLCC sockets and PGA packages are not electrically identical.
Generic I/O pins are not shown.
The information on this page is provided as a convenient summary. For detailed pin descriptions, see the preceding two pages.
For a detailed description of the configuration modes, see pages 2-190 through 2-200.
For pinout details, see pages 2-136 through 2-146.
2-139
Number of Available I/O Pins
64
Number of Package Pins
Max I/O 68
84
100
120
132
144
156
160
164
175
191
196
208
223
240
64
80
96
120
144
176
XC3020/XC3120
XC3030/XC3130
XC3042/XC3142
XC3064/XC3164
XC3090/XC3190
XC3195
54 58
58
64
74
74
70
70
70
64
80
82
96
110
120
138
138
142
144
144
144
176
176
X3478
44
34
176
144
XC3000 Families Pin Assignments
Xilinx offers the six different array sizes in the XC3000
families in a variety of surface-mount and through-hole
package types, with pin counts from 44 to 223.
Each chip is offered in several package types to accommo-
date the available PC board space and manufacturing
technology. Most package types are also offered with
different chips to accommodate design changes without
the need for PC board changes.
Note that there is no perfect match between the number of
bonding pads on the chip and the number of pins on a
package. In some cases, the chip has more pads than
there are pins on the package, as indicated by the informa-
tion (“unused” pads) below the line in the following table.
The IOBs of the unconnected pads can still be used as
storage elements if the specified propagation delays and
set-up times are acceptable.
In other cases, the chip has fewer pads than there are
pins on the package; therefore, some package pins are
not connected (n.c.), as shown above the line in the
following table.
3020
3030
3042
3064
3090
3195
Device
74
98
118
142
166
198
Pads
—
54 u
—
—
—
—
44
—
34 u
—
—
—
—
64
6 u
30 u
—
—
—
—
68
10 n.c.
14 u
34 u
50 u
82 u
114 u
84
26 n.c.
2 n.c.
18 u
—
—
—
100
—
—
14 n.c.
10 u
—
—
132
—
—
26 n.c.
2 u
—
—
144
—
—
—
18 n.c.
6 u
—
160
—
—
—
—
9 n.c
175
—
—
—
—
10 n.c.
—
176
—
—
—
—
42 n.c.
10 n.c.
208
—
—
—
—
—
25 n.c.
223
9 n.c.
32 u
n.c. = Unconnected package pin
u = Unbonded device pad X6095
Number of Package Pins
Number of Unbounded or Unconnected Pins
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-140
Pin No. XC3030
1 A0-WS-I/O
2 A1-CS2-I/O
3 A2-I/O
4 A3-I/O
5 A4-I/O
6 A14-I/O
7 A5-I/O
8GND
9 A13-I/O
10 A6-I/O
11 A12-I/O
12 A7-I/O
13 A11-I/O
14 A8-I/O
15 A10-I/O
16 A9-I/O
17 PWRDN
18 TCLKIN-I/O
19 I/O
20 I/O
21 I/O
22 I/O
23 I/O
24 VCC
25 I/O
26 I/O
27 I/O
28 I/O
29 I/O
30 I/O
31 M1-RDATA
32 M0-RTRIG
XC3000 Family 44-Pin PLCC Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
Pin No. XC3030
23 GND
24 I/O
25 I/O
26 XTL2(IN)-I/O
27 RESET
28 DONE-PGM
29 I/O
30 XTL1(OUT)-BCLK-I/O
31 I/O
32 I/O
33 I/O
34 VCC
35 I/O
36 I/O
37 I/O
38 DIN-I/O
39 DOUT-I/O
40 CCLK
41 I/O
42 I/O
43 I/O
44 I/O
Peripheral mode and Master Parallel mode are not supported in the PC44 package
XC3030 Family 64-Pin Plastic VQFP Pinouts
XC3000, XC3000A, XC3000L and XC3100 families have identical pinouts
Pin No. XC3030
33 M2-I/O
34 HDC-I/O
35 I/O
36 LDC-I/O
37 I/O
38 I/O
39 I/O
40 INIT-I/O
41 GND
42 I/O
43 I/O
44 I/O
45 I/O
46 I/O
47 XTAL2(IN)-I/O
48 RESET
49 DONE-PG
50 D7-I/O
51
XTAL1(OUT)-BCLKIN-I/O
52 D6-I/O
53 D5-I/O
54 CS0-I/O
55 D4-I/O
56 VCC
57 D3-I/O
58 CS1-I/O
59 D2-I/O
60 D1-I/O
61 RDY/BUSY-RCLK-I/O
62 D0-DIN-I/O
63 DOUT-I/O
64 CCLK
Pin No. XC3030
1GND
2 I/O
3 I/O
4 I/O
5 I/O
6 I/O
7 PWRDWN
8 TCLKIN-I/O
9 I/O
10 I/O
11 I/O
12 VCC
13 I/O
14 I/O
15 I/O
16 M1-RDATA
17 M0-RTRIG
18 M2-I/O
19 HDC-I/O
20 LDC-I/O
21 I/O
22 INIT-I/O
2-141
68 PLCC XC3020
XC3030 XC3020 XC3030, XC3042 84 PLCC 84 PGA
10 10 PWRDN 12 B2
11 11 TCLKIN-I/O 13 C2
12 — I/O* 14 B1
13 12 I/O 15 C1
14 13 I/O 16 D2
— — I/O 17 D1
15 14 I/O 18 E3
16 15 I/O 19 E2
— 16 I/O 20 E1
17 17 I/O 21 F2
18 18 VCC 22 F3
19 19 I/O 23 G3
— — I/O 24 G1
20 20 I/O 25 G2
— 21 I/O 26 F1
21 22 I/O 27 H1
22 — I/O 28 H2
23 23 I/O 29 J1
24 24 I/O 30 K1
25 25 M1-RDATA 31 J2
26 26 M0-RTRIG 32 L1
27 27 M2-I/O 33 K2
28 28 HDC-I/O 34 K3
29 29 I/O 35 L2
30 30 LDC-I/O 36 L3
— 31 I/O 37 K4
—I/O*38 L4
31 32 I/O 39 J5
32 33 I/O 40 K5
33 — I/O* 41 L5
34 34 INIT-I/O 42 K6
35 35 GND 43 J6
36 36 I/O 44 J7
37 37 I/O 45 L7
38 38 I/O 46 K7
39 39 I/O 47 L6
— 40 I/O 48 L8
— 41 I/O 49 K8
40 I/O* 50 L9
41 I/O* 51 L10
42 42 I/O 52 K9
43 43 XTL2(IN)-I/O 53 L11
68 PLCC
XC3030 XC3020
XC3020 XC3030, XC3042 84 PLCC 84 PGA
44 RESET 54 K10
45 DONE-PG 55 J10
46 D7-I/O 56 K11
47 XTL1(OUT)-BCLKIN-I/O 57 J11
48 D6-I/O 58 H10
— I/O 59 H11
49 D5-I/O 60 F10
50 CS0-I/O 61 G10
51 D4-I/O 62 G11
— I/O 63 G9
52 VCC 64 F9
53 D3-I/O 65 F11
54 CS1-I/O 66 E11
55 D2-I/O 67 E10
— I/O 68 E9
—I/O* 69 D11
56 D1-I/O 70 D10
57 RDY/BUSY-RCLK-I/O 71 C11
58 D0-DIN-I/O 72 B11
59 DOUT-I/O 73 C10
60 CCLK 74 A11
61 A0-WS-I/O 75 B10
62 A1-CS2-I/O 76 B9
63 A2-I/O 77 A10
64 A3-I/O 78 A9
—I/O* 79 B8
—I/O* 80 A8
65 A15-I/O 81 B6
66 A4-I/O 82 B7
67 A14-I/O 83 A7
68 A5-I/O 84 C7
1GND 1C6
2 A13-I/O 2 A6
3 A6-I/O 3 A5
4 A12-I/O 4 B5
5 A7-I/O 5 C5
—I/O* 6A4
—I/O* 7B4
6 A11-I/O 8 A3
7 A8-I/O 9 A2
8 A10-I/O 10 B3
9 A9-I/O 11 A1
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
outputs are default slew-rate limited.
This table describes the pinouts of three different chips in three different packages. The pin-description column lists 84 of the 118
pads on the XC3042 (and 84 of the 98 pads on the XC3030) that are connected to the 84 package pins. Ten pads, indicated by an
asterisk, do not exist on the XC3020, which has 74 pads; therefore the corresponding pins on the 84-pin packages have no
connections to an XC3020. Six pads on the XC3020 and 16 pads on the XC3030, indicated by a dash (—) in the 68 PLCC column,
have no connection to the 68 PLCC, but are connected to the 84-pin packages.
XC3000 Families 68-Pin PLCC, 84-Pin PLCC and PGA Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-142
XC3064/XC3090/XC3195 84-Pin PLCC Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
PLCC
Pin Number XC3064, XC3090, XC3195
54 RESET
55 DONE-PG
56 D7-I/O
57 XTL1(OUT)-BCLKIN-I/O
58 D6-I/O
59 I/O
60 D5-I/O
61 CS0-I/O
62 D4-I/O
63 I/O
64 VCC
65 GND✶
66 D3-I/O✶
67 CS1-I/O✶
68 D2-I/O✶
69 I/O
70 D1-I/O
71 RDY/BUSY-RCLK-I/O
72 D0-DIN-I/O
73 DOUT-I/O
74 CCLK
75 A0-WS-I/O
76 A1-CS2-I/O
77 A2-I/O
78 A3-I/O
79 I/O
80 I/O
81 A15-I/O
82 A4-I/O
83 A14-I/O
84 A5-I/O
1GND
2VCC✶
3 A13-I/O✶
4 A6-I/O✶
5 A12-I/O✶
6 A7-I/O✶
7 I/O
8 A11-I/O
9 A8-I/O
10 A10-I/O
11 A9-I/O
PLCC
Pin Number XC3064, XC3090, XC3195
12 PWRDN
13 TCLKIN-I/O
14 I/O
15 I/O
16 I/O
17 I/O
18 I/O
19 I/O
20 I/O
21 GND✶
22 VCC
23 I/O
24 I/O
25 I/O
26 I/O
27 I/O
28 I/O
29 I/O
30 I/O
31 M1-RDATA
32 M0-RTRIG
33 M2-I/O
34 HDC-I/O
35 I/O
36 LDC-I/O
37 I/O
38 I/O
39 I/O
40 I/O
41 INIT/I/O✶
42 VCC✶
43 GND
44 I/O
45 I/O
46 I/O
47 I/O
48 I/O
49 I/O
50 I/O
51 I/O
52 I/O
53 XTL2(IN)-I/O
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
ouptuts are default slew-rate limited.
In the PC84 package, XC3064, XC3090 and XC3195 have additional VCC and GND pins and thus a different pin definition than
XC3020/XC3030/XC3042.
✶
2-143
XC3000 Families 100-Pin QFP Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
Pin No.
35 50 47 I/O*
36 51 48 I/O*
37 52 49 M1-RD
38 53 50 GND*
39 54 51 MO-RT
40 55 52 VCC*
41 56 53 M2-I/O
42 57 54 HDC-I/O
43 58 55 I/O
44 59 56 LDC-I/O
45 60 57 I/O*
46 61 58 I/O*
47 62 59 I/O
48 63 60 I/O
49 64 61 I/O
50 65 62 INIT-I/O
51 66 63 GND
52 67 64 I/O
53 68 65 I/O
54 69 66 I/O
55 70 67 I/O
56 71 68 I/O
57 72 69 I/O
58 73 70 I/O
59 74 71 I/O*
60 75 72 I/O*
61 76 73 XTL2-I/O
62 77 74 GND*
63 78 75 RESET
64 79 76 VCC*
65 80 77 DONE-PG
66 81 78 D7-I/O
67 82 79 BCLKIN-XTL1-I/O
68 83 80 D6-I/O
Pin No.
11613 GND
2 17 14 A13-I/O
3 18 15 A6-I/O
4 19 16 A12-I/O
5 20 17 A7-I/O
62118 I/O*
72219 I/O*
8 23 20 A11-I/O
9 24 21 A8-I/O
10 25 22 A10-I/O
11 26 23 A9-I/O
12 27 24 VCC*
13 28 25 GND*
14 29 26 PWRDN
15 30 27 TCLKIN-I/O
16 31 28 I/O**
17 32 29 I/O*
18 33 30 I/O*
19 34 31 I/O
20 35 32 I/O
21 36 33 I/O
22 37 34 I/O
23 38 35 I/O
24 39 36 I/O
25 40 37 I/O
26 41 38 VCC
27 42 39 I/O
28 43 40 I/O
29 44 41 I/O
30 45 42 I/O
31 46 43 I/O
32 47 44 I/O
33 48 45 I/O
34 49 46 I/O
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs.
Programmed outputs are default slew-rate limited.
* This table describes the pinouts of three different chips in three different packges. The pin-description column lists 100 of the 118
pads on the XC3042 that are connected to the 100 package pins. Two pads, indicated by double asterisks, do not exist on the
XC3030, which has 98 pads; therefore the corresponding pins have no connections. Twenty-six pads, indicated by single or double
asterisks, do not exist on the XC3020, which has 74 pads; therefore, the corresponding pins have no connections. (See table on
page 2-139.)
TQFP
VQFP
CQFP PQFP TQFP
VQFP
CQFP PQFP
XC3020
XC3030
XC3042
XC3020
XC3030
XC3042 TQFP
VQFP
CQFP PQFP XC3020
XC3030
XC3042
69 84 81 I/O*
70 85 82 I/O*
71 86 83 I/O
72 87 84 D5-I/O
73 88 85 CS0-I/O
74 89 86 D4-I/O
75 90 87 I/O
76 91 88 VCC
77 92 89 D3-I/O
78 93 90 CS1-I/O
79 94 91 D2-I/O
80 95 92 I/O
81 96 93 I/O*
82 97 94 I/O*
83 98 95 D1-I/O
84 99 96 RDY/BUSY-RCLK-I/O
85 100 97 DO-DIN-I/O
86 1 98 DOUT-I/O
87 2 99 CCLK
88 3 100 VCC*
89 4 1 GND*
90 5 2 AO-WS-I/O
91 6 3 A1-CS2-I/O
92 7 4 I/O**
93 8 5 A2-I/O
94 9 6 A3-I/O
95 10 7 I/O*
96 11 8 I/O*
97 12 9 A15-I/O
98 13 10 A4-I/O
99 14 11 A14-I/O
100 15 12 A5-I/O
Pin No.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-144
PGA Pin
Number
C4 GND
A1 PWRDN
C3 I/O-TCLKIN
B2 I/O
B3 I/O
A2 I/O*
B4 I/O
C5 I/O
A3 I/O*
A4 I/O
B5 I/O
C6 I/O
A5 I/O
B6 I/O
A6 I/O
B7 I/O
C7 GND
C8 VCC
A7 I/O
B8 I/O
A8 I/O
A9 I/O
B9 I/O
C9 I/O
A10 I/O
B10 I/O
A11 I/O*
C10 I/O
B11 I/O
A12 I/O*
B12 I/O
A13 I/O*
C12 I/O
PGA Pin
Number
M3 DOUT-I/O
P1 CCLK
M4 VCC
L3 GND
M2 A0-WS-I/O
N1 A1-CS2-I/O
M1 I/O
K3 I/O
L2 A2-I/O
L1 A3-I/O
K2 I/O
J3 I/O
K1 A15-I/O
J2 A4-I/O
J1 I/O*
H1 A14-I/O
H2 A5-I/O
H3 GND
G3 VCC
G2 A13-I/O
G1 A6-I/O
F1 I/O*
F2 A12-I/O
E1 A7-I/O
F3 I/O
E2 I/O
D1 A11-I/O
D2 A8-I/O
E3 I/O
C1 I/O
B1 A10-I/O
C2 A9-I/O
D3 VCC
XC3000 Families 132-Pin Ceramic and Plastic PGA Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
outputs are default slew-rate limited.
* Indicates unconnected package pins (14) for the XC3042.
PGA Pin
Number
P14 RESET
M11 VCC
N13 DONE-PG
M12 D7-I/O
P13 XTL1-I/O-BCLKIN
N12 I/O
P12 I/O
N11 D6-I/O
M10 I/O
P11 I/O*
N10 I/O
P10 I/O
M9 D5-I/O
N9 CS0-I/O
P9 I/O*
P8 I/O*
N8 D4-I/O
P7 I/O
M8 VCC
M7 GND
N7 D3-I/O
P6 CS1-I/O
N6 I/O*
P5 I/O*
M6 D2-I/O
N5 I/O
P4 I/O
P3 I/O
M5 D1-I/O
N4 RDY/BUSY-RCLK-I/O
P2 I/O
N3 I/O
N2 D0-DIN-I/O
PGA Pin
Number
B13 M1-RD
C11 GND
A14 M0-RT
D12 VCC
C13 M2-I/O
B14 HDC-I/O
C14 I/O
E12 I/O
D13 I/O
D14 LDC-I/O
E13 I/O*
F12 I/O
E14 I/O
F13 I/O
F14 I/O
G13 I/O
G14 INIT-I/O
G12 VCC
H12 GND
H14 I/O
H13 I/O
J14 I/O
J13 I/O
K14 I/O
J12 I/O
K13 I/O
L14 I/O*
L13 I/O
K12 I/O
M14 I/O
N14 I/O
M13 XTL2(IN)-I/O
L12 GND
XC3042
XC3064 XC3042
XC3064 XC3042
XC3064 XC3042
XC3064
2-145
Pin
Number
97 I/O
98 I/O
99 I/O*
100 I/O
101 I/O*
102 D1-I/O
103 RDY/BUSY-RCLK-I/O
104 I/O
105 I/O
106 D0-DIN-I/O
107 DOUT-I/O
108 CCLK
109 VCC
110 GND
111 A0-WSI/O
112 A1-CS2-I/O
113 I/O
114 I/O
115 A2-I/O
116 A3-I/O
117 I/O
118 I/O
119 A15-I/O
120 A4-I/O
121 I/O*
122 I/O*
123 A14-I/O
124 A5-I/O
125 –
126 GND
127 VCC
128 A13-I/O
129 A6-I/O
130 I/O*
131 –
132 I/O*
133 A12-I/O
134 A7-I/O
135 I/O
136 I/O
137 A11-I/O
138 A8-I/O
139 I/O
140 I/O
141 A10-I/O
142 A9-I/O
143 VCC
144 GND
Pin
Number
49 I/O
50 I/O*
51 I/O
52 I/O
53 INIT-I/O
54 VCC
55 GND
56 I/O
57 I/O
58 I/O
59 I/O
60 I/O
61 I/O
62 I/O
63 I/O*
64 I/O*
65 I/O
66 I/O
67 I/O
68 I/O
69 XTL2(IN)-I/O
70 GND
71 RESET
72 VCC
73 DONE-PG
74 D7-I/O
75 XTL1(OUT)-BCLKIN-I/O
76 I/O
77 I/O
78 D6-I/O
79 I/O
80 I/O*
81 I/O
82 I/O
83 I/O*
84 D5-I/O
85 CS0-I/O
86 I/O*
87 I/O*
88 D4-I/O
89 I/O
90 VCC
91 GND
92 D3-I/O
93 CS1-I/O
94 I/O*
95 I/O*
96 D2-I/O
XC3000 Families 144-Pin Plastic TQFP Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
XC3042
XC3064
Pin
Number
1 PWRDN
2 I/O-TCLKIN
3 I/O*
4 I/O
5 I/O
6 I/O*
7 I/O
8 I/O
9 I/O*
10 I/O
11 I/O
12 I/O
13 I/O
14 I/O
15 I/O*
16 I/O
17 I/O
18 GND
19 VCC
20 I/O
21 I/O
22 I/O
23 I/O
24 I/O
25 I/O
26 I/O
27 I/O
28 I/O*
29 I/O
30 I/O
31 I/O*
32 I/O*
33 I/O
34 I/O*
35 I/O
36 M1-RD
37 GND
38 MO-RT
39 VCC
40 M2-I/O
41 HDC-I/O
42 I/O
43 I/O
44 I/O
45 LDC-I/O
46 I/O*
47 I/O
48 I/O
XC3042
XC3064 XC3042
XC3064
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
outputs are default slew-rate limited.
* Indicates unconnected package pins (24) for the XC3042.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-146
XC3000 Families160-Pin PQFP Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
PQFP XC3064, XC3090,
Pin Number XC3195
121 CCLK
122 VCC
123 GND
124 A0-WS-I/O
125 A1-CS2-I/O
126 I/O
127 I/O
128 A2-I/O
129 A3-I/O
130 I/O
131 I/O
132 A15-I/O
133 A4-I/O
134 I/O
135 I/O
136 A14-I/O
137 A5-I/O
138 I/O
139 GND
140 VCC
141 A13-I/O
142 A6-I/O
143 I/O
144 I/O
145 I/O
146 I/O
147 A12-I/O
148 A7-I/O
149 I/O
150 I/O
151 A11-I/O
152 A8-I/O
153 I/O
154 I/O
155 A10-I/O
156 A9-I/O
157 VCC
158 GND
159 PWRDWN
160 TCLKIN-I/O
PQFP XC3064, XC3090,
Pin Number XC3195
1 I/O
2 I/O
3 I/O
4 I/O
5 I/O
6 I/O
7 I/O
8 I/O
9 I/O
10 I/O
11 I/O
12 I/O
13 I/O
14 I/O
15 I/O
16 I/O
17 I/O
18 I/O
19 GND
20 VCC
21 I/O
22 I/O
23 I/O
24 I/O
25 I/O
26 I/O
27 I/O
28 I/O
29 I/O
30 I/O
31 I/O
32 I/O
33 I/O
34 I/O
35 I/O
36 I/O
37 I/O
38 I/O
39 I/O
40 M1-RDATA
PQFP XC3064, XC3090,
Pin Number XC3195
41 GND
42 M0–RTRIG
43 VCC
44 M2-I/O
45 HDC-I/O
46 I/O
47 I/O
48 I/O
49 LDC-I/O
50 I/O
51 I/O
52 I/O
53 I/O
54 I/O
55 I/O
56 I/O
57 I/O
58 I/O
59 INIT-I/O
60 VCC
61 GND
62 I/O
63 I/O
64 I/O
65 I/O
66 I/O
67 I/O
68 I/O
69 I/O
70 I/O
71 I/O
72 I/O
73 I/O
74 I/O
75 I/O
76 XTL2-I/O
77 GND
78 RESET
79 VCC
80 DONE/PG
PQFP XC3064, XC3090,
Pin Number XC3195
81 D7-I/O
82 XTL1-I/O-BCLKIN
83 I/O
84 I/O
85 I/O
86 D6-I/O
87 I/O
88 I/O
89 I/O
90 I/O
91 I/O
92 D5-I/O
93 CS0-I/O
94 I/O
95 I/O
96 I/O
97 I/O
98 D4-I/O
99 I/O
100 VCC
101 GND
102 D3-I/O
103 CS1-I/O
104 I/O
105 I/O
106 I/O
107 I/O
108 D2-I/O
109 I/O
110 I/O
111 I/O
112 I/O
113 I/O
114 D1-I/O
115 RDY/BUSY-RCLK-I/O
116 I/O
117 I/O
118 I/O
119 D0-DIN-I/O
120 DOUT-I/O
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
IOBs are default slew-rate limited.
*Indicates unconnected package pins (18) for the XC3064.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
2-147
XC3000 Families 175-Pin Ceramic and Plastic PGA Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
PGA Pin
Number
D13 I/O
B14 M1-RDATA
C14 GND
B15 M0-RTRIG
D14 VCC
C15 M2-I/O
E14 HDC-I/O
B16 I/O
D15 I/O
C16 I/O
D16 LDC-I/O
F14 I/O
E15 I/O
E16 I/O
F15 I/O
F16 I/O
G14 I/O
G15 I/O
G16 I/O
H16 I/O
H15 INIT-I/O
H14 VCC
J14 GND
J15 I/O
J16 I/O
K16 I/O
K15 I/O
K14 I/O
L16 I/O
L15 I/O
M16 I/O
M15 I/O
L14 I/O
N16 I/O
P16 I/O
N15 I/O
R16 I/O
M14 I/O
P15 XTL2(IN)-I/O
N14 GND
R15 RESET
P14 VCC
PGA Pin
Number
R3 D0-DIN-I/O
N4 DOUT-I/O
R2 CCLK
P3 VCC
N3 GND
P2 A0-WS-I/O
M3 A1-CS2-I/O
R1 I/O
N2 I/O
P1 A2-I/O
N1 A3-I/O
L3 I/O
M2 I/O
M1 A15-I/O
L2 A4-I/O
L1 I/O
K3 I/O
K2 A14-I/O
K1 A5-I/O
J1 I/O
J2 I/O
J3 GND
H3 VCC
H2 A13-I/O
H1 A6-I/O
G1 I/O
G2 I/O
G3 I/O
F1 I/O
F2 A12-I/O
E1 A7-I/O
E2 I/O
F3 I/O
D1 A11-I/O
C1 A8-I/O
D2 I/O
B1 I/O
E3 A10-I/O
C2 A9-I/O
D3 VCC
C3 GND
PGA Pin
Number
B2 PWRDN
D4 TCLKIN-I/O
B3 I/O
C4 I/O
B4 I/O
A4 I/O
D5 I/O
C5 I/O
B5 I/O
A5 I/O
C6 I/O
D6 I/O
B6 I/O
A6 I/O
B7 I/O
C7 I/O
D7 I/O
A7 I/O
A8 I/O
B8 I/O
C8 I/O
D8 GND
D9 VCC
C9 I/O
B9 I/O
A9 I/O
A10 I/O
D10 I/O
C10 I/O
B10 I/O
A11 I/O
B11 I/O
D11 I/O
C11 I/O
A12 I/O
B12 I/O
C12 I/O
D12 I/O
A13 I/O
B13 I/O
C13 I/O
A14 I/O
XC3090, XC3195XC3090, XC3195XC3090, XC3195 PGA Pin
Number
R14 DONE-PG
N13 D7-I/O
T14 XTL1(OUT)-BCLKIN-I/O
P13 I/O
R13 I/O
T13 I/O
N12 I/O
P12 D6-I/O
R12 I/O
T12 I/O
P11 I/O
N11 I/O
R11 I/O
T11 D5-I/O
R10 CS0-I/O
P10 I/O
N10 I/O
T10 I/O
T9 I/O
R9 D4-I/O
P9 I/O
N9 VCC
N8 GND
P8 D3-I/O
R8 CS1-I/O
T8 I/O
T7 I/O
N7 I/O
P7 I/O
R7 D2-I/O
T6 I/O
R6 I/O
N6 I/O
P6 I/O
T5 I/O
R5 D1-I/O
P5 RDY/BUSY-RCLK-I/O
N5 I/O
T4 I/O
R4 I/O
P4 I/O
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
outputs are default slew-rate limited.
Pins A2, A3, A15, A16, T1, T2, T3, T15 and T16 are not connected. Pin A1 does not exist.
XC3090, XC3195
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-148
89 DONE-PG
90 D7-I/O
91
XTAL1(OUT)-BCLKIN-I/O
92 I/O
93 I/O
94 I/O
95 I/O
96 D6-I/O
97 I/O
98 I/O
99 I/O
100 I/O
101 I/O
102 D5-I/O
103 CS0-I/O
104 I/O
105 I/O
106 I/O
107 I/O
108 D4-I/O
109 I/O
110
VCC
111 GND
112 D3-I/O
113 CS1-I/O
114 I/O
115 I/O
116 I/O
117 I/O
118 D2-I/O
119 I/O
120 I/O
121 I/O
122 I/O
123 I/O
124 D1-I/O
125
RDY/BUSY-RCLK-I/O
126 I/O
127 I/O
128 I/O
129 I/O
130 D0-DIN-I/O
131 DOUT-I/O
132 CCLK
133 VCC
134 GND
135 A0-WS-I/O
136 A1-CS2-I/O
137 –
138 I/O
139 I/O
140 A2-I/O
141 A3-I/O
142 –
143 –
144 I/O
145 I/O
146
A15-I/O
147 A4-I/O
148 I/O
149 I/O
150 A14-I/O
151 A5-I/O
152 I/O
153 I/O
154 GND
155 VCC
156 A13-I/O
157 A6-I/O
158 I/O
159 I/O
160 –
161 –
162 I/O
163 I/O
164 A12-I/O
165 A7-I/O
166 I/O
167 I/O
168 –
169 A11-I/O
170 A8-I/O
171 I/O
172 I/O
173 A10-I/O
174 A9-I/O
175 VCC
176 GND
Pin
Number XC3090
Pin
Number XC3090 Pin
Number XC3090
Pin
Number XC3090
1PWRDWN
2 TCLKIN-I/O
3 I/O
4 I/O
5 I/O
6 I/O
7 I/O
8 I/O
9 I/O
10 I/O
11 I/O
12 I/O
13 I/O
14 I/O
15 I/O
16 I/O
17 I/O
18 I/O
19 I/O
20 I/O
21 I/O
22 GND
23 VCC
24 I/O
25 I/O
26 I/O
27 I/O
28 I/O
29 I/O
30 I/O
31 I/O
32 I/O
33 I/O
34 I/O
35 I/O
36 I/O
37 I/O
38 I/O
39 I/O
40 I/O
41 I/O
42 I/O
43 I/O
44 –
XC3090 176-Pin TQFP Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
45 M1-RDATA
46 GND
47 M0-RTRIG
48 VCC
49 M2-I/O
50 HDC-I/O
51 I/O
52 I/O
53 I/O
54 LDC-I/O
55 –
56 I/O
57 I/O
58 I/O
59 I/O
60 I/O
61 I/O
62 I/O
63 I/O
64 I/O
65 INIT-I/O
66 VCC
67 GND
68 I/O
69 I/O
70 I/O
71 I/O
72 I/O
73 I/O
74 I/O
75 I/O
76 I/O
77 I/O
78 I/O
79 I/O
80 I/O
81 I/O
82 –
83 –
84 I/O
85 XTAL2(IN)-I/O
86 GND
87 RESET
88 VCC
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
outputs are default slew-rate limited.
2-149
XC3090 208-Pin PQFP Pinouts
XC3000, XC3000A, XC3000L, XC3100 and XC3100A families have identical pinouts
Pin
Number XC3090
157 –
158 –
159 –
160 GND
161 WS-A0-I/O
162 CS2-A1-I/O
163 I/O
164 I/O
165 A2-I/O
166 A3-I/O
167 I/O
168 I/O
169 –
170 –
171 –
172 A15-I/O
173 A4-I/O
174 I/O
175 I/O
176 –
177 –
178 A14-I/O
179 A5-I/O
180 I/O
181 I/O
182 GND
183 VCC
184 A13-I/O
185 A6-I/O
186 I/O
187 I/O
188 –
189 –
190 I/O
191 I/O
192 A12-I/O
193 A7-I/O
194 –
195 –
196 –
197 I/O
198 I/O
199 A11-I/O
200 A8-I/O
201 I/O
202 I/O
203 A10-I/O
204 A9-I/O
205 VCC
206 –
207 –
208 –
Pin
Number XC3090
53 –
54 –
55 VCC
56 M2-I/O
57 HDC-I/O
58 I/O
59 I/O
60 I/O
61 LDC-I/O
62 I/O
63 I/O
64 –
65 –
66 –
67 –
68 I/O
69 I/O
70 I/O
71 I/O
72 –
73 –
74 I/O
75 I/O
76 I/O
77 INIT-I/O
78 VCC
79 GND
80 I/O
81 I/O
82 I/O
83 –
84 –
85 I/O
86 I/O
87 I/O
88 I/O
89 I/O
90 –
91 –
92 –
93 I/O
94 I/O
95 I/O
96 I/O
97 I/O
98 I/O
99 I/O
100 XTL2-I/O
101 GND
102 RESET
103 –
104 –
Pin
Number XC3090
105 –
106 VCC
107 D/P
108 –
109 D7-I/O
110
XTL1-BCLKIN-I/O
111 I/O
112 I/O
113 I/O
114 I/O
115 D6-I/O
116 I/O
117 I/O
118 I/O
119 –
120 I/O
121 I/O
122 D5-I/O
123 CS0-I/O
124 I/O
125 I/O
126 I/O
127 I/O
128 D4-I/O
129 I/O
130 VCC
131 GND
132 D3-I/O
133 CS1-I/O
134 I/O
135 I/O
136 I/O
137 I/O
138 D2-I/O
139 I/O
140 I/O
141 I/O
142 –
143 I/O
144 I/O
145 D1-I/O
146
RDY/BUSY-RCLK-I/O
147 I/O
148 I/O
149 I/O
150 I/O
151 DIN-D0-I/O
152 DOUT-I/O
153 CCLK
154 VCC
155 –
156 –
Pin
Number XC3090
1–
2GND
3PWRDWN
4 TCLKIN-I/O
5 I/O
6 I/O
7 I/O
8 I/O
9 I/O
10 I/O
11 I/O
12 I/O
13 I/O
14 I/O
15 –
16 I/O
17 I/O
18 I/O
19 I/O
20 I/O
21 I/O
22 I/O
23 I/O
24 I/O
25 GND
26 VCC
27 I/O
28 I/O
29 I/O
30 I/O
31 I/O
32 I/O
33 I/O
34 I/O
35 I/O
36 I/O
37 –
38 I/O
39 I/O
40 I/O
41 I/O
42 I/O
43 I/O
44 I/O
45 I/O
46 I/O
47 I/O
48 M1-RDATA
49 GND
50 M0-RTRIG
51 –
52 –
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
outputs are default slew-rate limited.
*In PQ208, XC3090 and XC3195 have different pinouts.
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-150
XC3195 PQ208 and PG223 Pinouts
Pin
Description PG223 PQ208
A9-I/O B1 206
A10-I/O E3 205
I/O E4 204
I/O C2 203
I/O C1 202
I/O D2 201
A8-I/O E2 200
A11-I/O F4 199
I/O F3 198
I/O D1 197
I/O F2 196
I/O G2 194
A7-I/O G4 193
A12-I/O G1 192
I/O H2 191
I/O H3 190
I/O H1 189
I/O H4 188
I/O J3 187
I/O J2 186
A6-I/O J1 185
A13-I/O K3 184
VCC J4 183
GND K4 182
I/O K2 181
I/O K1 180
A5-I/O L2 179
A14-I/O L4 178
I/O L3 177
I/O L1 176
I/O M1 175
I/O M2 174
A4-I/O M4 173
A15-I/O N2 172
I/O N3 171
I/O P2 169
I/O R1 168
I/O N4 167
A3-I/O T1 166
A2-I/O R2 165
I/O P3 164
I/O T2 163
I/O P4 162
I/O U1 161
A1-CS2-I/O V1 160
A0-WS-I/O T3 159
GND R3 158
VCC R4 157
CCLK U2 156
DOUT-I/O V2 155
✶ ✶ Pin
Description PG223 PQ208
I/O U18 102
I/O P15 101
I/O T17 100
I/O T18 99
I/O P16 98
I/O R17 97
I/O N15 96
I/O R18 95
I/O P17 94
I/O N17 93
I/O N16 92
I/O M15 89
I/O M18 88
I/O M17 87
I/O L18 86
I/O L17 85
I/O L15 84
I/O L16 83
I/O K18 82
I/O K17 81
I/O K16 80
GND K15 79
VCC J15 78
INIT J16 77
I/O J17 76
I/O J18 75
I/O H16 74
I/O H15 73
I/O H17 72
I/O H18 71
I/O G17 70
I/O G18 69
I/O G15 68
I/O F16 67
I/O F17 66
I/O E17 63
I/O C18 62
I/O F15 61
I/O D17 60
LDC-I/O E16 59
I/O C17 58
I/O B18 57
I/O E15 56
HDC-I/O A18 55
M2-I/O A17 54
VCC D16 53
M0-RTIG B17 52
GND D15 51
M1/RDATA C16 50
✶Pin
Description PG223 PQ208
I/O B16 49
I/O A16 48
I/O D14 47
I/O C15 46
I/O B15 45
I/O A15 44
I/O C14 43
I/O D13 42
I/O B14 41
I/O C13 40
I/O B13 39
I/O B12 38
I/O D12 37
I/O A12 36
I/O B11 35
I/O C11 34
I/O A11 33
I/O D11 32
I/O A10 31
I/O B10 30
I/O C10 29
I/O C9 28
VCC D10 27
GND D9 26
I/O B9 25
I/O A9 24
I/O C8 23
I/O D8 22
I/O B8 21
I/O A8 20
I/O B7 19
I/O A7 18
I/O D7 17
I/O B6 14
I/O C6 13
I/O B5 12
I/O A4 11
I/O D6 10
I/O C5 9
I/O B4 8
I/O B3 7
I/O C4 6
I/O D5 5
I/O C3 4
I/O A3 3
TCLKIN-I/O A2 2
PWRDN B2 1
GND D4 208
VCC D3 207
✶
Unprogrammed IOBs have a default pull-up. This prevents an undefined pad level for unbonded or unused IOBs. Programmed
outputs are default slew-rate limited.
In the PQ208 package, pins 15, 16, 64, 65, 90, 91, 142, 143, 170 and 195 are not connected.
*In PQ208, XC3090 and XC3195 have different pinouts.
2-151
XC3000 Component Availability
PINS 44 64 68 84 100 132 144 160 164 175 176 208 223
TOP- TOP-
TYPE PLAST. PLAST. PLAST. PLAST. CERAM PLAST. PLAST. PLAST. BRAZED PLAST. CERAM. PLAST. PLAST. BRAZED PLAST. CERAM. PLAST. PLAST. CERAM.
PLCC VQFP PLCC PLCC PGA PQFP TQFP VQFP CQFP PGA PGA TQFP PQFP CQFP PGA PGA TQFP PQFP PGA
CODE PC44 VQ64 PC68 PC84 PG84 PQ100 TQ100 VQ100 CB100 PP132 PG132 TQ144 PQ160 CB164 PP175 PG175 TQ176 PQ208 PG223
XC3020 -50 M B M B
-70 C I C I C I M B C I C M B
-100 C I C I C I M B C I C M B
-125 CCCC
XC3030 -50 M
-70 C I C I C I C I M C I C
-100 C I C I C I C I M C I C
-125 C CCCCC
XC3042 -50 M B M B M B
-70 C I C I M B C I C C M B C C I M B
-100 C I C I M B C I C C M B C C I M B
-125 CCCC CC
XC3064 -50 M
-70 C I C I C I M C I
-100 C I C I C I M C I
-125 CCCC
XC3090 -50 M B M B
-70 C I C I C I M B C I C I M B C I
-100 C I C I C I M B C I C I M B C I
-125 CCCCC
XC3020A -7 C IC IC IC I
-6 CCCC
XC3030A -7 C IC IC IC IC IC I C I
-6 CCCCCC C
XC3042A -7 C IC IC I C I C IC IC I
-6 CCC C CCC
XC3064A -7 C I C IC IC IC I
-6 C CCCC
XC3090A -7 C I C I C IC IC IC I
-6 CC CCCC
XC3020L C
XC3030L CC C
XC3042L CCC
XC3064L C C
XC3090L C C
-5 C IC IC IC I
-4 C IC IC IC I
XC3120A -3 C IC IC IC I
-2 C IC IC IC I
-1 C IC IC IC I
-5 C IC IC IC IC IC I C
-4 C IC IC IC IC IC I C
XC3130A -3 C IC IC IC IC IC IC I
-2 C IC IC IC IC IC IC I
-1 C C C C C C C
-5 C I C I M B C I C M B C C I M B C I
-4 C IC IC I C C C IC I
XC3142A -3 C IC IC IC I C IC IC I
-2 C IC IC IC I C IC IC I
-1 C C C C C C C
-5 C I C IC IC IC I
-4 C I C IC IC IC I
XC3164A -3 C I C IC IC IC I
-2 C I C IC IC IC I
-1 C C C C C
-5 C I C IM BC IC I M BC I C I
-4 C I C I C IC IC IC I
XC3190A -3 C I C I C IC IC IC I
-2 C I C I C IC IC IC I
-1 C C C C C C
-5 C I C IM BC IC I M B C I C I
-4 C I C I C I C I C I C I
XC3195A -3 C I C I C I C I C I C I
-2 C I C I C I C I C I C I
-1 C C C C C C
C = Commercial = 0° to +85° C I = Industrial = -40° to +100° C M = Mil Temp = -55° to +125° C B = MIL-STD-883C Class B
Parentheses indicate future product plans
XC3000, XC3000A, XC3000L, XC3100, XC3100A Logic Cell Array Families
2-152
Example: XC3130A- 3 PC44C Temperature Range
Device Type
Block Delay Number of Pins
Package Type
XC3000, XC3000A, XC3000L, XC3100, XC3100A
The features of the original XC3000 family are described
on the preceding pages.
XC3100A is functionally identical with XC3000, but offers
substantially faster performance. There is also an addi-
tional high-end family member, the XC3195A.
XC3000L uses a 3.3 V supply voltage and has lower
power-down current.
The XC3000A, XC3000L and XC3100A families all offer
identical enhanced functionality. They are thus supersets
of the XC3000 familiy.
Additional routing resources provide improved perfor-
mance and higher density. There is now a direct connec-
tion from each CLB output to the data input of its nearest
TBUF. This speeds up the path and preserves general
routing resources that can be used for other purposes.
The CLB clock enable and the TBUF output enable are
now driven by two different vertical Longlines. In the
XC3000/3100 devices, the CLB clock enable signal and
the adjacent TBUF output enable signal can both be driven
only from the same vertical Longline. That makes these
two functions mutually exclusive, and thus creates place-
ment constraints. Using separate Longlines for these two
functions leads to improved density and performance,
especially in bus-oriented applications.
Bitstream error checking protects against erroneous
configuration.
Each Xilinx FPGA bitstream consists of a 40-bit preamble,
followed by a device-specific number of data frames. The
number of bits per frame is also device-specific; however,
each frame ends with three stop bits (111) followed by a
start bit for the next frame (0).
All devices in all XC3000 families start reading in a new
frame when they find the first 0 after the end of the previous
frame. XC3000/XC3100 devices do not check for the
correct stop bits, but XC3000A/XC3100A and XC3000L
devices check that the last three bits of any frame are
actually 111.
Under normal circumstances, all these FPGAs behave the
same way; however, if the bitstream is corrupted, an
XC3000/XC3100 device will always start a new frame as
soon as it finds the first 0 after the end of the previous
frame, even if the data is completely wrong or out-of-sync.
Given sufficient zeros in the data stream, the device will
also go Done, but with incorrect configuration and the
possibility of internal contention.
An XC3000A/XC3100A/XC3000L device starts any new
frame only if the three preceding bits are all ones. If this
check fails, it pulls INIT Low and stops the internal configu-
ration, although the Master CCLK keeps running. The user
must then start a new configuration by applying a >6 µs
Low level on RESET.
This simple check does not protect against random bit
errors, but it offers almost 100 percent protection against
erroneous configuration files, defective configuration data
sources, synchronization errors between configuration
source and FPGA, or PC-board level defects, such as
broken lines or solder-bridges.
A separate modification slows down the RESET input
before configuration by using a two-stage shift register
driven from the internal clock. It tolerates submicrosecond
High spikes on RESET before configuration. The XC3000
master can be connected like an XC4000 master, but with
its RESET input used instead of INIT. (On XC3000, INIT is
output only).
Soft start-up. After configuration, the outputs of all LCA
device in a daisy-chain become active simultaneously, as
a result of the same CCLK edge. In the original XC3000/
3100 devices, each output becomes active in either fast or
slew-rate limited mode, depending on the way it is config-
ured. This can lead to large ground-bounce signals. In the
new XC3000A/XC3000L/XC31000A devices, all outputs
become active first in slew-rate limited mode, reducing the
ground bounce. After this soft start-up, each individual
output slew rate is again controlled by the respective
configuration bit.
The XC3000, XC3000L, ZC3100A are fully supported by
the XACT Version 5.0, or later, development system.
XACT 5.0 provides many advanced features not available
with the XC3000 software such as timing-driven place and
route (XACT-Performance)and the X-BLOX module
generator.
For a detailed description of the device architecture, see pages 2-105 through 2-123.
For a detailed description of the configuration modes and their timing, see pages 2-124 through 2-132.
For detailed lists of package pin-outs, see pages 2-140 through 2-150.
For package physical dimensions and thermal data, see Section 4.
Ordering Information
