AT6000(LV) Series
9
The devices can be partially reconfigured while in opera-
tion. Portions of the device not being modified remain
operatio nal dur ing recon figurat ion. Simul taneou s confi gu-
ration of more than one device is also possible. Full
configuration takes as little as a millisecond, partial configu-
ration is even faster.
Refer to the Pin Function Description section following for a
brief summary of the pins used in c onfiguration. For more
informa tion about c onfi guration, r efe r to the AT6 000 Series
Configuration data sheet.
Pin Function Description
This section provides abbreviated descriptions of the vari-
ous AT6000 Series pins . For more complete descriptions,
refer to the AT6000 Series Configuration data sheet.
Pinout tables for the AT6000 series of devices follow.
Power Pins
VCC, VDD, GND, VSS
VCC and GND are the I/O supply pins, VDD and VSS are the
internal logic supply pins. VCC and VDD should be tied to the
same trace on the printed circuit board. GND and VSS
should be tied to the same trace on the printed circuit
board.
Input/Output Pins
All I/O pins can be used in the same way (refer to the I/O
section of the architecture description). Some I/O pins are
dual-function pins used during configuration of the array.
When not being u sed for con figuration, dual-functio n I/Os
are fully functional as normal I/O pins. On initial power-up,
all I/Os are configured as TTL inputs with a pull-up.
Dedicated Timing and Control Pins
CON
Configuration-in-process pin. After power-up, CON sta y-
sLow un til power - up initialization is comp le te, at whi c h tim e
CON is then released. CON is an open collector signal.
After power-up initiali zation, forcing CON low begins the
configuration process.
CS
Config uration en able p in. Al l conf igurat ion pins are i gnored
if CS is high. CS must be hel d low th rougho ut th e config u-
rat ion process. CS is a TTL input pin.
M0, M1, M2
Config uratio n mode pi ns are used to d etermi ne the confi g-
uration mode. All three are TTL input pins.
CCLK
Configuration clock pin. CCLK is a TTL input or a CMOS
output depending o n the mod e of o per at ion . In m ode s 1, 2,
3, and 6 it is an input . In modes 4 and 5 it i s an output wi th
a typical frequency of 1 MHz. In all modes, the rising edge
of the CCLK signal is used to sample inputs and change
outputs.
CLOCK
Extern al log ic sour c e used to drive the internal gl oba l c lo ck
line. Registers toggle on the risi ng edge of CLOCK. The
CLOCK signal is neither used nor affected by the configu-
ration modes. It is always a TTL input.
RESET
Array re gi ste r asy nchr ono us reset. R ES ET drives the inte r-
nal global reset. The RESET signal is neither used nor
affected by the configuration modes. It is always a TTL
input.
Dual-function Pins
When CON is high, du al-function I/O pins act as device
I/Os; when CON is low, dual-function pins are used as con-
figuration control or data signals as determined by the
configuration modes. Care must be taken when using
these pins to ensure that configuration activity does not
interfere with other circuitry connected to these pins in the
application.
D0 or I/O
Serial configuration modes use D0 as the serial data input
pin. Para llel configur ation modes use D0 as the least-s ig-
nificant bit. Input data must meet setup and hold
requirements with respect to the rising edge of CCLK. D0 is
a TTL input during configuration.
D1 to D7 or I/O
Parallel configuration modes use these pins as inputs.
Serial configuration modes do not use them. Data must
meet setup and hold requirements with respect to the rising
edge of CCLK. D1 - D7 are TTL inputs during configuration.
A0 to A16 or I/O
During configuration in modes 1, 2 and 5, these pins are
CMOS outputs and act as the address pins for a parallel
EPROM. A0 - A16 eliminates the need for an external
address counter when using an external parallel nonvolatile