is42s16128 Integrated Silicon Solution, Inc., is42s16128 Datasheet - Page 24

• Manufacturer Part Number: is42s16128
• Description: 128k Words Bits Banks Sdram
• Manufacturer: Integrated Silicon Solution, Inc.

Write With Auto-Precharge
The write with auto-precharge command first executes a
burst write operation and then puts the selected bank in
the precharged state automatically. After the precharge
completes the bank goes to the idle state. Thus this
command performs a write command and a precharge
command in a single operation.
During this operation, the delay period (t
last burst data input and the completion of the precharge
operation differs depending on the CAS latency setting.
The delay (t
precharge operation starts one clock period after the last
burst data input.
24
IS42S16128
CAS latency = 2, burst length = 4
CAS latency = 3, burst length = 4
COMMAND
COMMAND
DAL
) is t
CLK
CLK
I/O
I/O
WRITE WITH AUTO-PRECHARGE
WRITE WITH AUTO-PRECHARGE
RP
plus one CLK period. That is, the
WRITE A0
WRITE A0
D
D
IN
IN
(BANK 0)
(BANK 0)
0
0
D
D
IN
IN
1
1
DAL
) between the
D
D
IN
IN
2
2
D
D
IN
IN
3
3
Therefore, the selected bank can be made active after a
delay of t
The selected bank must be set to the active state before
executing this command.
The auto-precharge function is invalid if the burst length
is set to full page.
Integrated Silicon Solution, Inc. — 1-800-379-4774
PRECHARGE START
PRECHARGE START
DAL
CAS Latency
t
t
DAL
RP
.
t
DAL
t
t
DAL
ACT 0
RP
1CLK
+t
3
RP
ACT 0
ISSI
1CLK
+t
2
RP
03/13/00
Rev. A
®