A43L2632
Preliminary 1M X 32 Bit X 4 Banks Synchronous DRAM
PRELIMINARY (January, 2005, Version 0.0) AMIC Technology, Corp.
Document Title
1M X 32 Bit X 4 Banks Synchronous DRAM
Revision History
Rev. No. History Issue Date Remark
0.0 Initial issue January 13, 2005 Preliminary
A43L2632
Preliminary 1M X 32 Bit X 4 Banks Synchronous DRAM
PRELIMINARY (January, 2005, Version 0.0) 1 AMIC Technology, Corp.
Features
JEDEC standard 3.3V power supply
LVTTL compatible with multiplexed address
Four banks / Pulse RAS
MRS cycle with address key programs
- CAS Lat ency (2,3)
- Burst Length (1,2,4,8 & full page)
- Burst Type (Sequential & Interleave)
All inputs are sampled at the positive going edge of the
system clock
Deep Power Down Mode
Burst Read Single-bit Write operation
DQM for masking
Auto & self refresh
64ms refresh period (4K cycle)
Self refresh with programmable refresh period through
EMRS cycle
Programmable Power Reduction Feature by partial array
activation during Self-refresh through EMRS cycle
86 Pin TSOP (II)
operating temperature range: 0ºC to + 70ºC
Clock Frequency (max) : 166MHz @ CL=3 (-6)
143MHz @ CL=3 (-7)
General Description
The A43L2632 is 67,108,864 bits Low Power synchronous
high data rate Dynamic RAM organized as 4 X 1,048,576
words by 32 bits, fabricated with AMIC’s high performance
CMOS technology. Synchronous design allows precise
cycle control with the use of system clock. I/O transactions
are possible on every clock cycle. Range of operating
frequencies, programmable latencies allows the same
device to be useful for a variety of high bandwidth, high
performance memory system applications.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 2 AMIC Technology, Corp.
Pin Configuration
TSOP (II)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
VDD
DQ0
VDDQ
DQ1
DQ2
VSSQ
DQ3
VDDQ
VSSQ
WE
A11
BA0
BA1
A10/AP
A0
A1
A2
VDD
NC
VSSQ
VDDQ
VSSQ
VDDQ
VDD
DQ4
DQ5
DQ7
CAS
RAS
CS
DQ6
NC
VDD
DQM0
DMQ2
DQ16
DQ17
DQ18
DQ19
DQ20
DQ21
DQ22
DQ23
VSS
DQ15
VSSQ
DQ14
DQ13
VDDQ
DQ12
VSSQ
VDDQ
NC
A9
A8
A7
A6
A5
A4
A3
VSS
NC
VDDQ
VSSQ
VDDQ
VSSQ
VSS
DQ11
DQ10
DQ8
NC
CLK
CKE
DQ9
NC
VSS
DQM1
DMQ3
DQ31
DQ30
DQ29
DQ28
DQ27
DQ26
DQ25
DQ24
A43L2632
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 3 AMIC Technology, Corp.
Block Diagram
Bank Select
Row Buffer
Refresh Counter
Address Register
Row Decoder Column Buffer
LCBR
LRAS
CLK
ADD
Timing Regist er
Data Input Register
1M X 32
Sense AMP
Column Decoder
Latency & Burst Length
Programming Register
LRAS
LCAS
LRAS LCBR LWE LWCBR
DQM
CLK CKE CS RAS CAS WE DQM
I/O Control Output Buffer
LWE
DQM
DQi
1M X 32
1M X 32
1M X 32
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 4 AMIC Technology, Corp.
Pin Descriptions
Symbol Name Description
CLK System Clock Active on the positive going edge to sample all inputs.
CS Chip Select Disables or Enables device operation by masking or enabling all inputs except CLK,
CKE and L(U)DQM
CKE Clock Enable
Masks system clock to freeze operation from the next clock cycle.
CKE should be enabled at least one clock + tss prior to new command.
Disable input buffers for power down in standby.
A0~A11 Address Row / Column addresses are multiplexed on the same pins.
Row address : RA0~RA11, Column address: CA0~CA7
BS0, BS1 Bank Select Address Selects bank to be activated during row address latch time.
Selects band for read/write during column address latch time.
RAS Row Address Strobe Latches row addresses on the positive going edge of the CLK with RAS low.
Enables row access & precharge.
CAS Column Address
Strobe Latches column addresses on the positive going edge of the CLK with CAS low.
Enables column access.
WE Write Enable Enables write operation and Row precharge.
DQM0-3 Data Input/Output
Mask Makes data output Hi-Z, t SHZ after the clock and masks the output.
Blocks data input when DQM0-3 active.
DQ0-31 Data Input/Output Data inputs/outputs are mult iplexed on the same pins.
VDD/VSS Power
Supply/Ground Power Supply: +3.3V±0.125V/Ground
VDDQ/VSSQ Data Output
Power/Ground Provide isolated Power/Ground to DQs for improved noise immunity.
NC/RFU No Connection
A43L1632
PRELIMINARY (January, 2005, Version 0.0) 5 AMIC Technology, Corp.
Absolute Maximum Ratings*
Voltage on any pin relative to VSS (Vin, Vout ) . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to +3.6V
Voltage on VDD supply relative to VSS (VDD, VDDQ )
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5V to + 3.6V
Storage Temperature (TSTG) . . . . . . . . . . -55°C to +150°C
Soldering Temperature X Time (TSLODER) . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C X 10sec
Power Dissipation (PD) . . . . . . . . . . . . . . . . . . . . . . . . .0.8W
Short Circuit Current (Ios) . . . . . . . . . . . . . . . . . . . . 50mA
*Comments
Permanent device damage may occur if “Absolute Maximum
Ratings” are exceeded.
Functional operation should be restricted to recommended
operating condition.
Exposure to higher than recommended voltage for extended
periods of time could affect device reliability.
Capacitance (TA=25°C, f=1MHz)
Parameter Symbol Condition Min Typ Max Unit
Input Capacitance CI1 A0 to A10, BA0, BA1 2.5 4 pF
CI2
CLK, CKE, CS , RAS ,CAS ,WE ,
DQM 3 5.5 pF
Data Input/Output Capacitance CI/O DQ0 to DQ31 4 6.5 pF
DC Electrical Characteristics
Recommend operating conditions (Voltage referenced to VSS = 0V, TA = 0ºC to +70ºC or TA = -40ºC to +85ºC )
Parameter Symbol Min Typ Max Unit Note
Supply Voltage VDD,VDDQ 3 3.3 3.6 V
Input High Voltage V IH 2 - VDD+0.3 V
Input Low Voltage VIL -0.3 0 0.8 V Note 1
Output High Voltage VOH 2.0 - - V IOH = -1mA
Output Low Voltage VOL - - 0.4 V IOL = 1mA
Input Leakage Current IIL -5 - 5 µA Note 2
Output Leakage Current IOL -5 - 5 µA Note 3
Output Loading Condition See Figure 1
Note: 1. VIL (min) = -2.0V AC (pulse width ≤ 3ns).
2. Any input 0V ≤ VIN ≤ VDD + 0.3V, all other pins are not under test = 0V
3. Dout is disabled, 0V ≤ Vout ≤ VDD
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 6 AMIC Technology, Corp.
Decoupling Capacitance Guide Line
Recommended decoupling capacitance added to power line at board.
Parameter Symbol Value Unit
Decoupling Capacitance between VDD and VSS CDC1 0.1 + 0.01 µF
Decoupling Capacitance between VDDQ and VSSQ CDC2 0.1 + 0.01 µF
Note: 1. VDD and VDDQ pins are separated each other.
All VDD pins are connected in chip. All VDDQ pins are connected in chip.
2. VSS and VSSQ pins are separated each other
All VSS pins are connected in chip. All VSSQ pins are connected in chip.
DC Electrical Characteristics
(Recommended operating condition unless otherwise noted, TA = 0 to 70°C or TA = -40ºC to +85ºC )
Speed
Symbol Parameter Test Conditions -6 -7
Unit Notes
Icc1 Operating Current
(One Bank Active) Burst Length = 1
tRC ≥ tRC(min), tCC ≥ tCC(min), IOL = 0mA 85 80
mA 1
Icc2 P CKE ≤ VIL(max), tCC = 15ns 45 40
Icc2 PS
Precharge Standby Current
in power-down mode CKL ≤ VIL(max), tCC = ∞ 3 3
mA
ICC2N CKE ≥ VIH(min), CS ≥ VIH(min), tCC = 15ns
Input signals are changed one time during
30ns 8
ICC2NS
Precharge Standby Current
in non power-down mode
CKE ≥ VIH(min), CLK ≤ VIL(max), tCC = ∞
Input signals are stable. 1
mA
ICC3N Active Standby current in
non power-down mode
(One Bank Active) CKE ≥ VIH(min), CS ≥ VIH(min), tCC = 15ns
Input signals are changed one time during
30ns
65 60
mA
ICC4 Operating Current
(Burst Mode) IOL = 0mA, Page Burst
All bank Activated, tCCD = tCCD (min) 200 170 mA 1
ICC5 Refresh Current tRC ≥ tRC (min) 180 170 mA 2
ICC6 Self Refresh Current CKE = 0.2V 3 3
mA
Note: 1. Measured with outputs open. Addresses are changed only one time during tCC(min).
2. Refresh period is 64ms. Addresses are changed only one time during tCC(min).
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 7 AMIC Technology, Corp.
AC Operating Test Conditions
(VDD = 3.3V ±0.3V, TA = 0°C to +70°C or TA = -40ºC to +85ºC)
Parameter Value
AC input levels VIH/VIL = 2.4V/0.4V
Input timing measurement reference level 1.4V
Input rise and all time (See note3) tr/tf = 1ns/1ns
Output timing measurement reference level 1.4V
Output load condition See Fig.2
Output
870
Ω
1200
Ω
(Fig. 1) DC Output Load Circuit
Z
O
=50
Ω
OUTPUT
50
Ω
V
TT
=1.05V
30pF
(Fig. 2) AC Output Load Circuit
2.5V
30pF
V
OH
(DC) = 2.0V, I
OH
= -1mA
V
OL
(DC) = 0.4V, I
OL
= 1mA
AC Characteristics
(AC operating conditions unless otherwise noted)
-6 -7
Symbol Parameter
Min Max Min Max
Unit Note
CL=3 6 7
tCC CLK cycle time CL=2 7.5 1000 7.5 1000 ns 1
CL=3 - 5.5 - 5.5
tSAC CLK to valid
Output delay CL=2 - 6 - 6
ns 1,2
tOH Output data hold time 2.75 - 3 - ns 2
tCH CLK high pulse width 2 - 2.5 - ns 3
CL=CAS Latency.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 8 AMIC Technology, Corp.
AC Characteristics (continued)
(AC operating conditions unless otherwise noted)
-6 -7
Symbol Parameter Min Max Min Max Unit Note
tCL CLK low pulse widt h 2 - 2.5 - ns 3
CL=3 1.5 - 1.75 -
tSS Input setup time CL=2 2.5 - 2.5 - ns 3
tSH Input hold time 1 - 1 - ns 3
tSLZ CLK to output in Low-Z 1 - 1 - ns 2
CL=3 - 5.5 - 5.5
tSHZ CLK to output in Hi-Z CL=2 - 6 - 6 ns
CL=CAS Latency. *All AC parameters are measured from half to half.
Note : 1. Parameters depend on programmed CAS latency.
2. If clock rising time is longer than 1ns, (tr/2-0.5)ns should be added to the parameter.
3. Assumed input rise and fall time (tr & tf) = 1ns.
If tr & tf is longer than 1ns, transient time compensation should be considered,
i.e., [(tr + tf)/2-1]ns should be added to the parameter.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 9 AMIC Technology, Corp.
Operating AC Parameter
(AC operating conditions unless otherwise noted)
Version
Symbol Parameter -6 -7
Unit Note
tRRD(min) Row active to row active delay 12 15 ns 1
tRCD(min) RAS to CAS delay 15 15 ns 1
tRP(min) Row precharge time 15 15 ns 1
tRAS(min) 42 42 ns 1
tRAS(max) Row active time 100 µs
tRC(min) Row cycle time 63 65 ns 1
tCDL(min) Last data in new col. Address delay 6 7 ns 2
tRDL(min) Last data in row precharge 12 14 ns 2
tBDL(min) Last data in to burst stop 6 7 ns 2
tCCD(min) Col. Address to col. Address delay 1 1 ns
Note: 1. The minimum number of clock cycles is determined by dividing the minimum time required with clock cycle time and
then rounding off to the next higher integer.
2. Minimum delay is required to complete write.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 10 AMIC Technology, Corp.
Simplified Truth Table
Command CKEn-1 CKEn CS RAS CAS WE DQM BS0
BS1 A10
/AP A9~A0,
Notes
Register Mode Register Set H X L L L L X OP CODE 1,2
Auto Refresh H 3
Entry H L L L L H X X 3
L H H H 3
Refresh
Self
Refresh Exit L H
H X X X X X 3
Bank Active & Row Addr. H X L L H H X V Row Addr. 4
Auto Precharge Disable L 4 Read &
Column Addr. Auto Precharge Enable H X L H L H X V
H Column
Addr. 4,5
Auto Precharge Disable L 4 Write &
Column Addr. Auto Precharge Enable H X L H L L X V
H Column
Addr. 4,5
Burst Stop H X L H H L X X
Bank Selection V L
Precharge Both Banks H X L L H L X
X H X
L H H H
Entry H L
H X X X X
Clock Suspend or
Active Power Down Exit L H X X X X X X
L H H H
Entry H L
H X X X X
L V V V
Precharge Power Down Mode Exit L H
H X X X X X
DQM H X V X 6
L H H H
No Operation Command H X H X X X X X
Deep Power Down Entry H L L H H L X X
Deep Power Down Exit L H X X X X X X 7
(V = Valid, X = Don’t Care, H = Logic High, L = Logic Low)
Note : 1. OP Code: Operand Code
A0~A10, BS0, BS1: Program keys. (@MRS)
2. MRS can be issued only when all banks are at precharge state.
A new command can be issued after 2 clock cycle of MRS.
3. Auto refresh functions is same as CBR refr esh of DRAM.
The automatical precharge without Row precharge command is meant by “Auto”.
Auto/Self refresh can be issued only when all banks are at precharge state.
4. BS0, BS1 : Bank select address.
If both BS1 and BS0 are “Low” at read, write, row active and precharge, bank A is selected.
If both BS1 is “Low” and BS0 is “High” at read, write, row active and precharge, bank B is selected.
If both BS1 is “High” and BS0 is “Low” at read, write, row active and precharge, bank C is selected.
If both BS1 and BS0 are “High” at read, write, row active and precharge, bank D is selected.
If A10/AP is “High” at row precharge, BS1 and BS0 is ignored and all banks are selected.
5. During burst read or write with auto precharge, new read/write command cannot be issued.
Another bank read/write command can be issued at every burst length.
6. DQM sampled at positive going edge of a CLK masks the data-in at the very CLK (Write DQM latency is 0)
but masks the data-out Hi-Z state after 2 CLK cycles. (Read DQM latency is 2)
7. After Deep Power Down mode exit, a full new initialization of the memory device is mandatory.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 11 AMIC Technology, Corp.
Mode Register Filed Table to Program Modes
Register Programmed with MRS
Address BS1 BS0 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
Function 0 0 RFU W.B.L TM CAS Latency BT Burst Length
(Note 3) (Note 2) (Note 1)
Test Mode CAS Latency Burst Type Burst Length
A8 A7 Type A6 A5 A4 Latency A3 Type A2 A1 A0 BT=0 BT=1
0 0 Mode Register Set 0 0 0 Reserved 0 Sequential 0 0 0 1 1
0 1 0 0 1 1 1 Interleave 0 0 1 2 2
1 0 0 1 0 2 0 1 0 4 4
1 1
Vendor
Use
Only 0 1 1 3 0 1 1 8 8
Write Burst Length 1 0 0 Reserved 1 0 0 Reserved Reserved
A9 Length 1 0 1 Reserved 1 0 1 Reserved Reserved
0 Burst 1 1 0 Reserved 1 1 0 Reserved Reserved
1 Single Bit 1 1 1 Reserved
1 1 1 256(Full) Reserved
Note : 1. RFU(Reserved for Future Use) should stay “0” during MRS cycle.
2. If A9 is high during MRS cycle, “Burst Read Single Bit Write” function will be enabled.
3. BS0,BS1 must be 0,0 to select t he Mode Register (vs. the Extended Mode Register).
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 12 AMIC Technology, Corp.
Power Up Sequence
1. Apply power and start clock, Attempt to maintain CKE = “H”, DQM = “H” and the other pins are NOP condition at inputs.
2. Maintain stable power, stable clock and NOP input condition for a minimum of 200µs.
3. Issue precharge commands for all banks of the devices.
4. Issue 2 or more auto-refresh commands.
5. Issue a mode register set command to initialize the mode register.
cf.) Sequence of 4 & 5 may be changed.
The device is now ready for normal operation.
Burst Sequence (Burst Length = 4)
Initial address
A1 A0 Sequential Interleave
0 0 0 1 2 3 0 1 2 3
0 1 1 2 3 0 1 0 3 2
1 0 2 3 0 1 2 3 0 1
1 1 3 0 1 2 3 2 1 0
Burst Sequence (Burst Length = 8)
Initial address
A2 A1 A0 Sequential Interleave
0 0 0 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
0 0 1 1 2 3 4 5 6 7 0 1 0 3 2 5 4 7 6
0 1 0 2 3 4 5 6 7 0 1 2 3 0 1 6 7 4 5
0 1 1 3 4 5 6 7 0 1 2 3 2 1 0 7 6 5 4
1 0 0 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3
1 0 1 5 6 7 0 1 2 3 4 5 4 7 6 1 0 3 2
1 1 0 6 7 0 1 2 3 4 5 6 7 4 5 2 3 0 1
1 1 1 7 0 1 2 3 4 5 6 7 6 5 4 3 2 1 0
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 13 AMIC Technology, Corp.
Device Operations
Clock (CLK)
The clock input is used as the reference for all SDRAM
operations. All operations are synchronized to the positive
going edge of the clock. The clock transitions must be
monotonic between VIL and VIH. During operation with CKE
high all inputs are assumed to be in valid state (low or high)
for the duration of set up and hold time around positive edge
of the clock for proper functionality and ICC specifications.
Clock Enable (CLK)
The clock enable (CKE) gates the clock onto SDRAM. If CKE
goes low synchronously with clock (set-up and hold time
same as other inputs), the internal clock is suspended from
the next clock cycle and the state of output and burst address
is frozen as long as the CKE remains low. All other inputs are
ignored from the next clock cycle after CKE goes low. When
all banks are in the idle state and CKE goes low
synchronously with clock, t he SDRAM enters t he power down
mode from the next clock cycle. The SDRAM remains in the
power down mode ignoring the other inputs as long as CKE
remains low. The power down exit is synchronous as the
internal clock is suspended. When CKE goes high at least
“tSS + 1 CLOCK” before the high going edge of the clock, then
the SDRAM becomes active from the same clock edge
accepting all the input commands.
Bank Select (BS0, BS1)
This SDRAM is organized as 4 independent banks of
524,288 words X 32 bits memory arrays. The BS0, BS1
inputs is latched at the time of assertion of RAS and CAS
to select the bank to be used for the operation. The bank
select BS0, BS1 is latched at bank activat e, read, write mode
register set and precharge operations.
Address Input (A0 ~ A11)
The 19 address bits required to decode the 524,288 word
locations are multiplexed into 11 address input pins
(A0~A11). The 11 bit row address is latched along with RAS ,
BS0 and BS1 during bank activate command. The 8 bit
column address is latched along with CAS , WE, BS0 and
BS1during read or write command.
NOP and Device Deselect
When RAS , CAS and WE are high, the SDRAM performs
no operation (NOP). NOP does not initiate any new
operation, but is needed to complete operations which
require more than single clock like bank activate, burst read,
auto refresh, etc. The device deselect is also a NOP and is
entered by asserting CS high. CS high disables the
command decoder so that RAS , CAS and WE, and all the
address inputs are ignored.
Power-Up
The following sequence is recommended for POWER UP
1. Power must be applied to either CKE and DQM inputs to
pull them high and other pins are NOP condition at the
inputs before or along with VDD (and VDDQ) supply.
The clock signal must also be asserted at t he same time.
2. After VDD reaches the desired voltage, a minimum pause
of 200 microseconds is required with inputs in NOP
condition.
3. All banks must be precharged now.
4. Perform a minimum of 2 Auto refresh cycles to stabilize the
internal circuitry.
5. Perform a MODE REGISTER SET cycle to program the
CAS latency, burst length and burst type as the default
value of mode register is undefined.
At the end of one clock cycle from the mode register set
cycle, the device is ready for operation.
When the above sequence is used for Power-up, all the
out-puts will be in high impedance state. The high
impedance of outputs is not guaranteed in any other
power-up sequence.
cf.) Sequence of 4 & 5 may be changed.
Mode Register Set (MRS)
The mode register stores the data for controlling the various
operation modes of SDRAM. It programs the CAS latency,
addressing mode, burst length, test mode and various vendor
specific options to make SDRAM useful for variety of different
applications. The default value of the mode register is not
defined, therefore the mode register must be written after
power up to operate the SDRAM. The mode register is
written by asserting low on CS ,RAS , CAS ,WE (The
SDRAM should be in active mode with CKE already high
prior to writing the mode register). The state of address pins
A0~A10, BS0 and BS1 in the same cycle as
CS ,RAS ,CAS ,WE going low is the data written in the
mode register. One clock cycle is required to complete the
write in the mode register. The mode register contents can
be changed using the same command and clock cycle
requirements during operation as long as all banks are in the
idle state. The mode register is divided into various fields
depending on functionality. The burst length field uses
A0~A2, burst type uses A3, addressing mode uses A4~A6,
A7~A8, A10, BS0 and BS1 are used for vendor specific
options or test mode. And the write burst length is
programmed using A9. A7~A8, A10, BS0 and BS1 must be
set to low for normal SDRAM operation.
Refer to table for specific codes for various burst length,
addressing modes and CAS latencies. BS0 and BS1 have to
be set to “0” to enter the Mode Register.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 14 AMIC Technology, Corp.
Device Operations (continued)
Bank Activate
The bank activate command is used to select a random row
in an idle bank. By asserting low on RAS and CS with
desired row and bank addresses, a row access is initiated.
The read or write operation can occur after a time delay of
tRCD(min) from the time of bank activation. tRCD(min) is an
internal timing parameter of SDRAM, therefore it is
dependent on operating clock frequency. The minimum
number of clock cycles required between bank activate and
read or write command should be calculated by dividing
tRCD(min) with cycle time of the clock and then rounding off
the result to the next higher integer. The SDRAM has 4
internal banks on the same chip and shares part of the
internal circuitry to reduce chip area, therefore it restricts the
activation of all banks simultaneously. Also the noise
generated during sensing of each bank of SDRAM is high
requiring some time for power supplies to recover before the
other bank can be sensed reliably. tRRD(min) specifies the
minimum time required between activating different banks.
The number of clock cycles required between different bank
activation must be calculated similar t o tRCD specification. T he
minimum time required for the bank to be active to initiate
sensing and restoring the complete row of dynamic cells is
determined by tRAS(min) specification before a precharge
command to that active bank can be asserted. T he maximum
time any bank can be in the active state is determined by
tRAS(max). The number of cycles for both tRAS(min) and
tRAS(max) can be calculated similar to tRCD specification.
Burst Read
The burst read command is used to access burst of data on
consecutive clock cycles from an active row in an active
bank. The burst read command is issued by asserting low on
C
S
and CAS with WE being high on the positive edge of
the clock. The bank must be active for at least tRCD(min)
before the burst read command is issued. The first output
appears CAS latency number of clock cycles after the issue
of burst read command. The burst length, burst sequence
and latency from the burst read command is determined by
the mode register which is already programmed. The burst
read can be initiated on any column address of the active
row. The address wraps around if the initial address does not
start from a boundary such that number of outputs from each
I/O are equal to the burst length programmed in the mode
register. The output goes into high-impedance at the end of
the burst, unless a new burst read was initiated to keep the
data output gapless. The burst read can be terminated by
issuing another burst read or burst writ e in the same bank or
the other active bank or a precharge command to the same
bank. The burst stop command is valid at every page burst
length.
Burst Write
The burst write command is similar to burst read command,
and is used to write data into the SDRAM consecutive clock
cycles in adjacent addresses depending on burst length and
burst sequence. By asserting low on CS ,CASand WE with
valid column address, a write burst is initiated. The data
inputs are provided for the initial address in the same clock
cycle as the burst write command. The input buffer is
deselected at the end of the burst length, even though the
internal writing may not have been completed yet. The burst
write can be terminated by issuing a burst read and DQM for
blocking data inputs or burst write in the same or the other
active bank. The burst stop command is valid only at full
page burst length where the writing continues at the end of
burst and the burst is wrap around. The write burst can also
be terminated by using DQM for blocking data and
precharging the bank “tRDL” after the last data input to be
written into the active row. See DQM OPERATION also.
DQM Operation
The DQM is used to mask input and output operation. It
works similar to OE during read operation and inhibits writing
during write operation. The read latency is two cycles from
DQM and zero cycle for write, which means DQM masking
occurs two cycles later in the read cycle and occurs in the
same cycle during write cycle. DQM operation is
synchronous with the clock, therefore the masking occurs for
a complete cycle. The DQM signal is important during burst
interrupts of write with read or precharge in the SDRAM. Due
to asynchronous nature of the internal write, the DQM
operation is critical to avoid unwanted or incomplete writes
when the complete burst write is not required.
Precharge
The precharge operation is performed on an active bank by
asserting low on CS ,RAS ,WE and A10/AP with valid BA
of the bank to be precharged. The precharge command can
be asserted anytime after tRAS(min) is satisfied from the bank
activate command in the desired bank. “tRP” is defined as the
minimum time required to precharge a bank.
The minimum number of clock cycles required to complete
row precharge is calculated by dividing “tRP” with clock cycle
time and rounding up to the next higher int eger. Care should
be taken to make sure that burst write is completed or DQM
is used to inhibit writing before precharge command is
asserted. The maximum time any bank can be active is
specified by tRAS(max). Therefore, each bank has to be
precharged within tRAS(max) from the bank activate
command. At the end of precharge, the bank enters the idle
state and is ready to be activated again.
Entry to Power Down, Auto refresh, Self refresh and Mode
register Set etc, is possible only when all banks are in idle
state.
Auto Precharge
The precharge operation can also be performed by using
auto precharge. The SDRAM internally generates the timing
to satisfy tRAS(min) and “t RP” for the programmed burst length
and CAS latency. The auto precharge command is issued at
the same time as burst read or burst write by asserting high
on A10/AP. If burst read or burst write command is issued
with low on A10/AP, the bank is left active until a new
command is asserted. Once auto precharge command is
given, no new commands are possible to that particular bank
until the bank achieves idle state.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 15 AMIC Technology, Corp.
All Banks Precharge
All banks can be precharged at the same time by using
Precharge all command. Asserting low on CS ,RAS and
WE with high on A10/AP after both banks have satisfied
tRAS(min) requirement, performs precharge on all banks. At
the end of tRP after performing precharge all, all banks are in
idle state.
Auto Refresh
The storage cells of SDRAM need to be refreshed every
64ms to maintain data. An auto refresh cycle accomplishes
refresh of a single row of storage cells. The internal counter
increments automatically on every auto refresh cycle to
refresh all the rows. An auto refresh command is issued by
asserting low on CS ,RAS and CAS with high on CKE and
WE. The auto refresh command can only be asserted with
all banks being in idle state and the device is not in power
down mode (CKE is high in the previous cycle). The time
required to complete the auto refresh operation is specified
by “tRC(min)”. The minimum number of clock cycles required
can be calculated by dividing “tRC” with clock cycle time and
then rounding up to the next higher integer. The auto refresh
command must be followed by NOP’s until the auto refresh
operation is completed. All banks will be in the idle state at
the end of auto refresh operation. The auto refresh is the
preferred refresh mode when the SDRAM is being used for
normal data transactions. The auto refresh cycle can be
performed once in 15.6us or a burst of 4096 auto refresh
cycles once in 64ms.
Self Refresh
The self refresh is another refresh mode available in the
SDRAM. The self refresh is the preferred refresh mode for
data retention and low power operation of SDRAM. In self
refresh mode, the SDRAM disables the internal clock and all
the input buffers except CKE. The refresh addressing and
timing is internally generated to reduce power consumption.
The self refresh mode is entered from all banks idle state by
asserting low on CS ,RAS ,CAS and CKE with high on
WE. Once the self refresh mode is entered, only CKE state
being low matters, all the other inputs including clock are
ignored to remain in the self refresh.
The self refresh is exit ed by rest arting the external clock and
then asserting high on CKE. This must be f ollowed by NOP’s
for a minimum time of “tRC” before the SDRAM reaches idle
state to begin normal operation. If the system uses burst auto
refresh during normal operation, it is recommended to used
burst 4096 auto refresh cycles immediately after exiting self
refresh.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 16 AMIC Technology, Corp.
1) Click Suspended During Write (BL=4)
Masked by CKE
Q0 Q1 Q3
Q0 Q2 Q3
Suspended Dout
2) Clock Suspended During Read (BL=4)
WR
Masked by CKE
D0 D1 D2 D3
D0 D1 D2 D3
Not Written
DQ(CL3)
DQ(CL2)
Internal
CLK
CKE
CMD
CLK
RD
Q2
Q1
Note: CLK to CLK disable/enable=1 clock
Basic feature And Function Descriptions
1. CLOCK Suspend
2. DQM Operation
* Note : 1. DQM makes data out Hi-Z after 2 clocks which should masked by CKE “L”.
2. DQM masks both data-in and data-out.
1) Write Mask (BL=4)
Masked by CKE
Q0 Q2 Q3
Q1 Q2 Q3
DQM to Data-out Mask = 2
2) Read Mask (BL=4)
WR
Masked by CKE
D0 D1 D3
D0 D1 D3
DQM to Data-in Mask = 0CLK
DQ(CL3)
DQ(CL2)
DQM
CMD
CLK
RD
Hi-Z
Hi-Z
Q0 Q2 Q4
2) Read Mask (BL=4)
RD
Hi-Z
Hi-Z
Hi-Z Q6 Q7 Q8
Hi-Z
Q1 Q3
Hi-Z Hi-Z Q5 Q6 Q7
CLK
CMD
CKE
DQM
DQ(CL2)
DQ(CL3)
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 17 AMIC Technology, Corp.
3. CAS Interrupt (I)
Note : 1. By “Interrupt”, It is possible t o stop burst read/write by external command before the end of burst.
By “CAS Interrupt”, to stop burst read/write by CAS access; read, write and block write.
2. tCCD : CAS to CAS delay. (=1CLK)
3. tCDL : Last data in to new column address delay. (= 1CLK).
1) Read interrupted by Read (BL=4)
Note 1
RD RD
AB
QA0 QB0 QB1 QB2 QB3
QA0 QB0 QB1 QB2 QB3
CLK
CMD
ADD
DQ(CL2)
DQ(CL3) t
CCD
Note2
2) Write interrupted by Write (BL =2)
WR WR
AB
CLK
CMD
ADD t
CCD Note2
DA0 DB0 DB1
t
CDL
Note3
DQ
3) Write interrupted by Read (BL =2)
WR RD
AB
t
CCD Note2
DA0 QB0 QB1
t
CDL
Note3
DQ(CL2)
QB0 QB1
DQ(CL3) DA0
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 18 AMIC Technology, Corp.
4. CAS Interrupt (II) : Read Interrupted Write & DQM
* Note : 1. To prevent bus contention, there should be at least one gap between data in and data out.
2. To prevent bus contention, DQM should be issued which makes a least one gap between data in and data out.
RD WR
D0 D1 D2 D3
RD WR
D0 D1 D2 D3
WRRD
Hi-Z
Hi-Z D0 D1 D2 D3
RD WR
D0 D1 D2 D3Q0 Hi-Z
Note 1
RD WR
D0 D1 D2 D3
RD WR
D0 D1 D2 D3
WRRD
Hi-Z D0 D1 D2 D3
RD
WR
D0 D1 D2Q0 Hi-Z
Note 2
D0 D1 D2 D3
RD WR
WR
(1) CL=2, BL=4
CLK
i) CMD
DQM
DQ
ii) CMD
DQM
DQ
iii) CMD
DQM
DQ
iv) CMD
DQM
DQ
(2) CL=3, BL=4
CLK
i) CMD
DQM
DQ
ii) CMD
DQM
DQ
iii) CMD
DQM
DQ
iv) CMD
DQM
DQ
v) CMD
DQM
DQ D3
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 19 AMIC Technology, Corp.
5. Write Interrupted by Precharge & DQM
Note : 1. To inhibit invalid write, DQM should be issued.
2. This precharge command and burst write command should be of the same bank, otherwise it is not precharge
interrupt but only another bank precharge of dual banks operation.
6. Precharge
7. Auto Precharge
* Note : 1. The row active command of the precharge bank can be issued aft er tRP from this point.
The new read/write command of other active bank can be issued from this point.
At burst read/write with auto precharge, CAS interrupt of the same/another bank is illegal.
WR PRE
D0 D1 D2 D3
CLK
CMD
DQ
1) Normal Write (BL=4)
t
RDL
RD PRE
Q0 Q1 Q2 Q3
CLK
CMD
DQ(CL2)
2) Read (BL=4)
Q0 Q1 Q2 Q3DQ(CL3)
WR
D0 D1 D2 D3
CLK
CMD
DQ
1) Normal Write (BL=4)
Note 1
RD
Q0 Q1 Q2 Q3
CLK
CMD
DQ(CL2)
2) Read (BL=4)
Q0 Q1 Q2 Q3DQ(CL3)
Auto Precharge Starts
Note 1
Auto Precharge Starts
WR PRE
Note 2
Note 1
D0 D1 D2 D3
Masked by DQM
CLK
CMD
DQM
DQ
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 20 AMIC Technology, Corp.
8. Burst Stop & Interrupted by Precharge
WR
D0 D1 D2 D3
CLK
CMD
DQM
DQ
1) Normal Write (BL=4)
PRE
t
RDL
Note 1
WR
D0 D1 D2 D3
CLK
CMD
DQM
DQ
2) Write Burst Stop (BL=8)
STOP
t
BDL
Note 2
D4 D5
RD
Q0 Q1
CLK
CMD
DQ(CL2)
1) Read Interrupted by Precharge (BL=4)
PRE
Note 3
DQ(CL3) Q0 Q1
1
2
RD
Q0 Q1
CLK
CMD
DQ(CL2)
4) Read Burst Stop (BL=4)
STOP
DQ(CL3) Q0 Q1
1
2
9. MRS
Note : 1. tRDL: 1CLK
2. tBDL: 1CLK; Last data in to burst stop delay.
Read or write burst stop command is valid at every burst length.
3. Number of valid output data after row precharge or burst stop: 1,2 for CAS latency = 2, 3 respect ively.
4. PRE: All banks precharge if necessary.
MRS can be issued only when all banks are in precharged state.
PRE MRS
Note 1
CLK
CMD
Mode Register Set
2CLK
ACT
t
RP
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 21 AMIC Technology, Corp.
10. Clock Suspend Exit & Power Down Exit
11. Auto Refresh & Self Refresh
* Note : 1. Active power down : one or more bank active state.
2. Precharge power down : both bank precharge state.
3. The auto refr esh is the same as CBR refresh of conventional DRAM.
No precharge commands are required after Auto Refresh command.
During tRC from auto refresh command, other command can not be accepted.
4. Before executing auto/self refresh command, both banks must be idle stat e.
5. MRS, Bank Active, Auto/Self Refresh, Power Down Mode Entry.
6. During self refresh mode, refr esh interval and refresh operation are performed int ernally.
After self refresh entry, self refresh mode is kept while CKE is LOW.
During self refresh mode, all inputs expect CKE will be don’t cared, and outputs will be in Hi-Z state.
During tRC from self refresh exit command, any other command can not be accepted.
Before/After self refresh mode, burst auto refresh cycle (4K cycles ) is recommended.
2) Self Refresh
CLK
CMD
1) Auto Refresh
CKE
Internal
CLK
CLK
CMD SR
CKE
PRE
Note 4
PRE AR CMD
Note 5
~
~
~
~
~
~
~
~
t
RP
t
RC
Note 3
Note 6
~
~
CMD
~
~
Note 4
t
RP
t
RC
~
~
~
~
~
~
2) Power Down (=Precharge Power Down) Exit
Note 1
CLK
CMD
1) Clock Suspend (=Active Power Down) Exit
RD
t
SS
CKE
Internal
CLK
Note 2
CLK
CMD ACT
CKE
Internal
CLK
t
SS
NOP
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 22 AMIC Technology, Corp.
12. About Burst Type Control
Sequential counting At MRS A3=”0”. See the BURST SEQUENCE TABE.(BL=4,8)
BL=1,2,4,8 and full page wrap around.
Basic
MODE Interleave counting At MRS A3=” 1”. See the BURST SEQUENCE T ABE.(BL=4,8)
BL=4,8 At BL=1,2 Interleave Counting = Sequential Counting
Random
MODE Random column Access
tCCD = 1 CLK
Every cycle Read/Write Command with random column address can realize
Random Column Access.
That is similar to Extended Data Out (EDO) Operation of convention DRAM.
13. About Burst Length Control
1 At MRS A2,1,0 = “000”.
At auto precharge, tRAS should not be violat ed.
2 At MRS A2,1,0 = “001”.
At auto precharge, tRAS should not be violat ed.
4 At MRS A2,1,0 = “010”
Basic
MODE
8 At MRS A2,1,0 = “011”.
Special
MODE
BRSW At MRS A9=”1”.
Read burst = 1,2,4,8, full page/write Burst =1
At auto precharge of write, tRAS should not be violated.
RAS Interrupt
(Interrupted by Precharge)
Before the end of burst, Row precharge command of the same bank
Stops read/write burst with Row precharge.
tRDL= 2 with DQM, valid DQ after burst stop is 1,2 for CL=2,3 respectively
During read/write burst with auto precharge, RAS interrupt cannot be issued.
Interrupt
MODE
CAS Interrupt Before the end of burst, new read/write stops read/write burst and starts new
read/write burst or block write.
During read/write burst with auto precharge, CAS interrupt can not be issued.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 23 AMIC Technology, Corp.
Power On Sequence for Low Power SDRAM
KEY KEY
High level is necessary
High-Z
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
CLOCK
CKE
CS
RAS
CAS
ADDR
BS0
A10/AP
WE
DQM
DQ
Precharge
(All Banks) Auto Refresh Auto Refresh Normal
MRS Row Active
(A-Bank)
: Don't care
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~~
~
~
~
~
~
~
~
~
~
Ra
~
~
~
~
~
~
~
~
BS1
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
Ra
~
~
~
~
~
~
~
~
t
PR
t
RC
t
RC
Extended
MRS
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 24 AMIC Technology, Corp.
Single Bit Read-Write-Read Cycles (Same Page) @CAS Latency=3, Burst Length=1
Rb
High
t
RCD
t
RP
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS0, BS1
A10/AP
WE
DQM
DQ
Row Active Read Write Row Active
: Don't care
t
CH
t
CL
t
CC
Ra Ca Cb Cc
BS BS BS BS BS BS
Ra Rb
Qa Db Qc
t
RAS
t
RC
t
SH
t
SS
*Note 1
t
SH
t
SS
t
CCD
t
SH
t
SS
t
SH
t
SS
t
SS
t
SH
*Note 2 *Note 2,3 *Note 2,3 *Note 2,3 *Note 4 *Note 2
*Note 3 *Note 3 *Note 3 *Note 4
t
SH
t
SS
t
SH
t
SS
t
SH
t
SS
t
RA
C
t
SA
C
t
SLZ
t
OH
t
SHZ
Read
Precharge
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 25 AMIC Technology, Corp.
* Note : 1. All inputs can be don’t care when CS is high at t he CLK high going edge.
2. Bank active & read/write are controlled by BS0, BS1.
BS1 BS0 Active & Read/Write
0 0 Bank A
0 1 Bank B
1 0 Bank C
1 1 Bank D
3. Enable and disable auto precharge function are controlled by A10/AP in read/write command.
A10/AP BS1 BS0 Operation
0 0 Disable auto precharge, leave bank A active at end of burst.
0 1 Disable auto precharge, leave bank B active at end of burst.
1 0 Disable auto precharge, leave bank C active at end of burst.
0
1 1 Disable auto precharge, leave bank D active at end of burst.
0 0 Enable auto precharge, precharge bank A at end of burst.
0 1 Enable auto precharge, precharge bank B at end of burst.
1 0 Enable auto precharge, precharge bank C at end of burst.
1
1 1 Enable auto precharge, precharge bank D at end of burst.
4. A10/AP and BS0, BS1 control bank precharge when precharge command is asserted.
A10/AP BS1 BS0 Precharge
0 0 0 Bank A
0 0 1 Bank B
0 1 0 Bank C
0 1 1 Bank D
1 X X All Banks
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 26 AMIC Technology, Corp.
Read & Write Cycle at Same Bank @Burst Length=4
High
t
RC
t
RCD
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS0
WE
DQM
DQ
(CL = 2)
Row Active
(A-Bank) Read
(A-Bank) Precharge
(A-Bank) Row Active
(A-Bank) Precharge
(A-Bank)
: Don't care
*Note 1
*Note 2
Ra Ca0 Rb Cb0
Ra RbA10/AP
Qa0
t
OH
Qa1 Qa2 Qa3 Db0 Db1 Db2 Db3
t
RAC
t
SAC
*Note 3 t
SHZ
*Note 4
Qa0
t
OH
Qa1 Qa2 Qa3 Db0 Db1 Db2 Db3
t
RAC
t
SAC
*Note 3 t
SHZ
*Note 4 t
RDL
Write
(A-Bank)
DQ
(CL = 3)
BS1
t
RDL
*Note : 1. Minimum row cycle times is required to complete internal DRAM operation.
2. Row precharge can interrupt burst on any cycle. [CAS latency-1] valid output data available after Row
enters precharge. Last valid output will be Hi-Z after tSHZ from the clock.
3. Access time from Row address. tCC*(tRCD + CAS latency-1) + tSAC
4. Output will be Hi-Z after the end of burst. (1,2,4 & 8)
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 27 AMIC Technology, Corp.
Page Read & Write Cycle at Same Bank @Burst Length=4
t
RDL
High
t
RCD
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS0
WE
DQM
DQ
(CL=2)
Row Active
(A-Bank) Read
(A-Bank) Precharge
(A-Bank)
: Don't care
*Note 2
Ra Ca Cb Cc
RaA10/AP
Qa0 Qa1 Qb0 Qb1 Dc0 Dc1 Dd0 Dd1
Qa0 Qa1 Qb0
Write
(A-Bank)
Cd
t
CDL
*Note1 *Note3
Dc0 Dc1 Dd0 Dd1
Read
(A-Bank) Write
(A-Bank)
DQ
(CL=3)
BS1
Qb2
Qb1
*Note : 1. To write data before burst read ends, DQM should be asserted three cycle prior to write
command to avoid bus contention.
2. Row precharge will interrupt writing. Last data input, tRDL before Row precharge, will be written.
3. DQM should mask invalid input data on precharge command cycle when asserting precharge
before end of burst. Input data after Row precharge cycle will be masked internally.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 28 AMIC Technology, Corp.
Page Read Cycle at Different Bank @Burst Length = 4
Read
(C-Bank)
Row Active
(D-Bank)
Read
(B-Bank)
Read
(A-Bank)
High
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS1
Row Active
(A-Bank)
Row Active
(B-Bank) : Don't care
RAa RBb
A10/AP
CBb
Row Active
(C-Bank)
*Note 1
*Note 2
CAa
RAa
WE
DQM
QBb2QBb1QAa0 QAa1 QAa2 QBb0 QCc0 QCc1 QCc2 QDd0 QDd1 QDd2
QBb2QBb1QAa0 QAa1 QAa2 QBb0 QCc0 QCc1 QCc2 QDd0 QDd1 QDd2
Read
(D-Bank)
Precharge
(C-Bank)
Precharge
(D-Bank)
DQ
(CL=2)
DQ
(CL=3)
BS0
RBb RCc RDd
Precharge
(A-Bank) Precharge
(B-Bank)
RCc CCcRDd CDd
* Note : 1. CS can be don’t care when RAS , CAS and WE are high at the clock high going edge.
2. To interrupt a burst read by row precharge, both the read and the precharge banks must be the same.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 29 AMIC Technology, Corp.
Page Write Cycle at Different Bank @Burst Length=4
High
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS1
Row Active
(A-Bank)
Row Active
(B-Bank)
: Don't care
A10/AP
Write
(A-Bank)
WE
DBb1DBb0DAa0 DAa1 DAa2 DAa3 DBb2 DBb3 DCc0 DCc1
Write
(C-Bank)
Precharge
(All Banks)
DQM
DQ t
CDL
DDd0 DDd1
*Note 2
t
RDL
*Note 1
Write
(D-Bank)
Write
(B-Bank)
Row Active
(C-Bank)
Row Active
(D-Bank)
RAa RBb CBbCAa RCc RDd CCc CDd
RAa
BS0
RBb RCc RDd
CDd2
* Note:
1. To interrupt burst write by Row precharge, DQM should be asserted to mask invalid input data.
2. To interrupt burst write by Row precharge, both the write and precharge banks must be the same.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 30 AMIC Technology, Corp.
Read & Write Cycle at Different Bank @Burst Length=4
High
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS1
Row Active
(A-Bank) Read
(A-Bank)
: Don't care
RAa CAa
A10/AP
RDb
Precharge
(A-Bank)
CDb CBc
RAa
WE
QAa2QAa1QAa0 QAa3 DDb0
Write
(D-Bank) Read
(B-Bank)
DQM
QBc0 QBc1
RBc
RBCRDb t
CDL
*Note 1
QAa3QAa2QAa0 QAa1 DDb0 DDb1 QBc0DDb2 DDb3 QBc1 QBc2
DQ
(CL=2)
DDb1 DDb2 DDb3
DQ
(CL=3)
Row Active
(B-Bank)
Row Active
(D-Bank)
BS0
* Note : tCDL should be met to complete write.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 31 AMIC Technology, Corp.
Read & Write Cycle with Auto Precharge @Burst Length=4
High
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
CLOCK
CKE
CS
RAS
CAS
ADDR
BS1
Row Active
(A-Bank)
Row Active
(D-Bank)
: Don't care
RAa RBb
A10/AP
CAa
Auto Precharge
Start Point
(A-Bank/CL=2)
RAa
WE
QAa2QAa1QAa0 QAa3 DDb0
Auto Precharge
Start Point
(D-Bank)
DQM
CBb
QAa3QAa2QAa0 QAa1 DDb0 DDb1 DDb2 DDb3
DQ
(CL=2)
DDb1 DDb2 DDb3
DQ
(CL=3)
Write with
Auto Precharge
(D-Bank)
RBb
Read with
Auto Precharge
(A-Bank)
BS0
Auto Precharge
Start Point
(A-Bank/CL=3)
*Note : tRCD should be controlled to meet minimum tRAS before internal precharge start.
(In the case of Burst Length=1 & 2, BRSW mode)
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 32 AMIC Technology, Corp.
Clock Suspension & DQM Operation Cycl e @CAS Latency = 2, Burst Length=4
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS1
Row Active
: Don't care
Ra
A10/AP
Ca
Ra
WE
DQM
Qa1 Qb0 Qb1 Dc0
DQ
Clock
Suspension
Read
Bank 0
Cb
Read
Bank 0
Qa0 Dc2
* Note 1
Qa2
Cc
Clock
Suspension
t
SHZ
Qa3
t
SHZ
Write
DQM
Write
Bank 0
Read DQM
BS0
* Note : DQM needed to prevent bus contention.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 33 AMIC Technology, Corp.
Read Interrupted by Precharge Command & Read Burst Stop Cy cle @Burst Length=Full Page
High
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS1
Row Active
(A-Bank)
: Don't care
RAa
A10/AP
CAa
WE
QAa3QAa2QAa1 QAa4 QAb0
DQM
QAa4QAa3QAa1 QAa2 QAb0 QAb1 QAb2 QAb3
DQ
(CL=2)
QAb1 QAb2 QAb3
DQ
(CL=3)
Precharge
(A-Bank)
Read
(A-Bank)
CAb
Read
(A-Bank)
Burst Stop
1
QAa0 QAb4 QAb5
1
QAa0
2
QAb4 QAb5
2
BS0
RAa
* Note : 1. At full page mode, burst is wrap-around at the end of burst. So auto precharge is impossible.
2. About the valid DQ’s after burst stop, it is same as the case of RAS interrupt.
Both cases are illustrated above timing diagram. See the label 1,2 on them.
But at burst write, burst stop and RAS interrupt should be compared carefully.
Refer the timing diagram of “Full page write burst stop cycle”.
3. Burst stop is valid at every burst length.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 34 AMIC Technology, Corp.
Write Interrupted by Precharge Command & Write Burst Stop Cycle @ Burst Length = Full Page
High
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
CLOCK
CKE
CS
RAS
CAS
ADDR
BS1
Row Active
(A-Bank)
: Don't care
RAa
A10/AP
CAa
WE
DQM
DAa4DAa3DAa1 DAa2 DAb0 DAb1 DAb2 DAb3
DQ
Precharge
(A-Bank)
Write
(A-Bank)
CAb
Write
(A-Bank)
Burst Stop
DAa0 DAb4 DAb5
t
RDL
t
BDL
* Note 2
BS0
RAa
* Note : 1. At full page mode, burst is wrap-around at the end of burst. So auto precharge is impossible.
2. Data-in at the cycle of interrupted by precharge cannot be written into the corresponding memory cell.
It is defined by AC parameter of tRDL(=2CLK).
DQM at write interrupted by precharge command is needed to prevent invalid write.
DQM should mask invalid input data on precharge command cycle when asserting precharge before end of burst.
Input data after Row precharge cycle will be masked internally.
3. Burst stop is valid at every burst length.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 35 AMIC Technology, Corp.
Active/Precharge Power Down Mode @CAS Lantency=2, Burst Length=4
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS1
Precharge
Power-down
Exit
: Don't care
A10/AP
Active
Power-down
Entry
Row
Active
WE
Qa2
Read Precharge
DQM
DQ Qa0 Qa1
Precharge
Power-down
Entry
t
SS
t
SS
* Note 2
* Note 1
*Note 3
t
SS
t
SS
Ra Ca
Ra
Active
Power-down
Exit
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
BS0
~
~
~
~
~
~
~
~
t
SHZ
* Note : 1. All banks should be in idle state prior to entering precharge power down mode.
2. CKE should be set high at least “1CLK + tSS” prior to Row active command.
3. Cannot violate minimum refresh specification. (64ms)
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 36 AMIC Technology, Corp.
Self Refresh Entry & Exit Cycle
* Note : TO ENTER SELF REFRESH MODE
1.
CS, RAS & CAS and CKE should be low at the same clock cycle.
2. After 1 clock cycle, all the inputs including the system clock can be don’t care except for CKE.
3. The device remains in self refresh mode as long as CKE stays “Low”.
(cf.) Once the device enters self refresh mode, minimum tRAS is required before exit from self refresh.
TO EXIT SELF REFRESH MODE
4. System clock restart and be stable before returning CKE high.
5.
CS starts from high.
6. Minimum tRC is required after CKE going high to complete self refresh exit.
7. 4K cycle of burst auto refresh is required before self refresh entry and after self refresh exit.
If the system uses burst refresh.
0 12345678910111213141516171819
CLOCK
CKE
CS
RAS
CAS
ADDR
BS0, BS1
: Don't care
A10/AP
WE
Self Refresh Exit Auto Refresh
DQM
DQ
Self Refresh Entry
t
SS
* Note 4
* Note 1
~
~
~
~
~
~
~
~
~
~
* Note 3
* Note 2
~
~
t
SS
* Note 6
t
RC
min.
~
~
~
~
* Note 5
~
~
~
~
* Note 7 * Note 7
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
Hi-ZHi-Z
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 37 AMIC Technology, Corp.
Mode Register Set Cycle Auto Refresh Cycle
0 123456 012345678910
CLOCK
CKE
CS
RAS
CAS
ADDR
: Don't care
WE
Auto Refresh New Command
DQM
DQ
MRS
~
~~
~
* Note 1
~
~
~
~
Hi-ZHi-Z
High High
~
~
~
~
t
RC
*Note 2
~
~
~
~
~
~
~
~
~
~
Key
* Note 3
~
~
~
~
New
Command
~
~
~
~
Ra
* All banks precharge should be completed before Mode Register Set cycle and auto refresh cycle.
MODE REGISTER SET CYCLE
* Note : 1. CS, RAS , CAS & WE activation at the same clock cycle with address key will set internal
mode register.
2. Minimum 2 clock cycles is required before new RAS activation.
3. Please refer to Mode Register Set table.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 38 AMIC Technology, Corp.
Function Truth Table (Table 1)
Current
State CS RA
S
CAS WE BA Address Action Note
H X X X X X NOP
L H H H X X NOP
L H H L X X ILLEGAL 2
L H L X BA CA, A10/AP ILLEGAL 2
L L H H BA RA Row Active; Latch Row Address
L L H L BA A10/AP NOP 4
L L L H X X Auto Refr esh or Self Refresh 5
IDLE
L L L L OP Code Mode Register Access 5
H X X X X X NOP
L H H H X X NOP
L H H L X X ILLEGAL 2
L H L H BA CA,A10/AP Begin Read; Latch CA; Determine AP
L H L L BA CA,A10/AP Begin Write; Latch CA; Determine AP
L L H H BA RA ILLEGAL 2
L L H L BA PA Precharge
Row
Active
L L L X X X ILLEGAL
H X X X X X NOP(Continue Burst to End →Row Active)
L H H H X X NOP(Continue Burst to End →Row Active)
L H H L X X Term burst →Row Active
L H L H BA CA,A10/AP Term burst; Begin Read; Latch CA; Determine AP 3
L H L L BA CA,A10/AP Term burst; Begin Write; Latch CA; Determine AP 3
L L H H BA RA ILLEGAL 2
L L H L BA A10/AP Term Burst ; Precharge timing for Reads 3
Read
L L L X X X ILLEGAL
H X X X X X NOP(Continue Burst to End→Row Active)
L H H H X X NOP(Continue Burst to End→Row Active)
L H H L X X Term burst →Row Active
L H L H BA CA,A10/AP Term burst; Begin Read; Latch CA; Determine AP 3
L H L L BA CA,A10/AP Term burst; Begin Write; Latch CA; Determine AP 3
L L H H BA RA ILLEGAL 2
L L H L BA A10/AP Term Burst; Precharge timing for Writes 3
Write
L L L X X X ILLEGAL
H X X X X X NOP(Continue Burst to End→Precharge)
L H H H X X NOP(Continue Burst to End→Precharge)
L H H L X X ILLEGAL
L H L H BA CA,A10/AP ILLEGAL 2
L H L L BA CA,A10/AP ILLEGAL 2
L L H X BA RA, PA ILLEGAL
Read with
Auto
Precharge
L L L X X X ILLEGAL 2
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 39 AMIC Technology, Corp.
Function Truth Table (Table 1, Continued)
Current
State CS RAS CAS
WE BS Address Action Note
H X X X X X NOP(Continue Burst t o End →Precharge)
L H H H X X NOP(Cont inue Burst to End→Precharge)
L H H L X X ILLEGAL
L H L H BS CA,A10/AP ILLEGAL 2
L H L L BS CA,A10/AP ILLEGAL 2
L L H X BS RA, PA ILLEGAL
Write with
Auto
Precharge
L L L X X X ILLEGAL 2
H X X X X X NOP→Idle after tRP
L H H H X X NOP→Idle after tRP
L H H L X X ILLEGAL
L H L X BS CA,A10/AP ILLEGAL 2
L L H H BS RA ILLEGAL 2
L L H L BS A10/AP
NOP→Idle after tRP 2
Precharge
L L L X X X ILLEGAL 4
H X X X X X NOP→Row Active after tRCD
L H H H X X NOP→Row Active after tRCD
L H H L X X ILLEGAL
L H L X BS CA,A10/AP ILLEGAL 2
L L H H BS RA ILLEGAL 2
L L H L BS A10/AP ILLEGAL 2
Row
Activating
L L L X X X ILLEGAL 2
H X X X X X NOP→Idle after tRC
L H H X X X NOP→Idle after tRC
L H L X X X ILLEGAL
L L H X X X ILLEGAL
Refreshing
L L L X X X ILLEGAL
H X X X X X NOP→Idle after 2 clocks
L H H H H X NOP→Idle after 2 clocks
L H H L X X ILLEGAL
L H L X X X ILLEGAL
Mode
Register
Accessing
L L X X X X ILLEGAL
Abbreviations
RA = Row Address BS = Bank Address AP = Aut o Precharge
NOP = No Operation Command CA = Column Address PA = Precharge All
Note: 1. All entries assume that CKE was active (High) during the preceding clock cycle and the current clock cycle.
2. Illegal to bank in specified state: Function may be legal in the bank indicated by BA, depending on the state of that bank.
3. Must satisfy bus contention, bus turn around, and/or write recovery requirements.
4. NOP to bank precharging or in idle state. May precharge bank indicated by BS (and PA).
5. Illegal if any banks is not idle.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 40 AMIC Technology, Corp.
Function Truth Table for CKE (Table 2)
Current
State CKE
n-1 CKE
n CS RA
S
CAS WE Address Action Note
H X X X X X X INVALID
L H H X X X X
Exit Self Refresh→ABI after tRC 6
L H L H H H X
Exit Self Refresh→ABI after tRC 6
L H L H H L X ILLEGAL
L H L H L X X ILLEGAL
L H L L X X X ILLEGAL
Self
Refresh
L L X X X X X NOP(Maintain Self Refresh)
H X X X X X X INVALID
L H H X X X X
Exit Power Down→ABI 7
L H L H H H X
Exit Power Down→ABI 7
L H L H H L X ILLEGAL
L H L H L X X ILLEGAL
L H L L X X X ILLEGAL
Both
Bank
Precharge
Power
Down
L L X X X X X NOP(Maintain Power Down Mode)
H H X X X X X Refer to Table 1
H L H X X X X Enter Power Down 8
H L L H H H X Enter Power Down 8
H L L H H L X ILLEGAL
H L L H L X X ILLEGAL
H L L L H H RA Row (& Bank ) Active
H L L L L H X Enter Self Refresh 8
H L L L L L OPCODE MRS
All
Banks
Idle
L L X X X X X NOP
H H X X X X X Refer to Operations in Table 1
H L X X X X X Begin Clock Suspend next cycle 9
L H X X X X X Exit Clock Suspend next cycle 9
Any State
Other than
Listed
Above L L X X X X X Maintain clock Suspend
Abbreviations : ABI = All Banks Idle
Note: 6. After CKE’s low to high transition to exit self refresh mode, a minimum of tRC(min) has to be elapse before issuing a new
command.
7. CKE low to high transition is asynchronous as if it restarts internal clock.
A minimum setup time “tSS + one clock” must be sat isfied before any command can be issued other than exit.
8. Power-down and self refresh can be entered only when all the banks are in idle state.
9. Must be a legal command.
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 41 AMIC Technology, Corp.
Ordering Information
Part No. Min. Cycle Time
(ns) Max. Clock Frequency
(MHz) Access Time Package
A43L2632V-6 6 166 5.5 ns 86 TSOP (II)
A43L2632V-7 7 143 5.5 ns 86 TSOP (II)
A43L2632
PRELIMINARY (January, 2005, Version 0.0) 42 AMIC Technology, Corp.
Package Information
TSOP 86L (Type II) Outline Dimensions unit: inches/mm
1
E1
E
c
86
A2
A
e
D
b
L
Detail "A"
43
44
Seating Plane
L
1
0.21 REF
0.665 REF
A
1
-C-
S
D
0.10
Detail "A"
-C-
θ
0.25
Gauge Plane
θ
1
R
2
R
1
Dimensions in inches Dimensions in mm
Symbol Min Nom Max Min Nom Max
A - - 0.047 - - 1.20
A1 0.002 0.004 0.006 0.05 0.10 0.15
A2 0.037 0.039 0.041 0.95 1.00 1.05
b 0.007 - 0.011 0.17 - 0.27
c 0.005 - 0.008 0.12 - 0.21
D 0.875 BSC 22.22 BSC
S 0.024 REF 0.61 REF
E 0.463 BSC 11.76 BSC
E1 0.400 BSC 10.16 BSC
e 0.020 BSC 0.50 BSC
L 0.016 0.020 0.024 0.40 0.50 0.60
L1 0.031 REF 0.80 REF
R1 0.005 - - 0.12 - -
R2 0.005 - 0.010 0.12 - 0.25
θ 0° - 8° 0° - 8°
θ1 0° - - 0° - -
Notes:
1. The maximum value of dimension D includes end flash.
2. Dimension E does not include resin fins.
3. Dimension S includes end flash.
