iPEM
2.1 Gb SDRAM-DDR2
Austin Semiconductor, Inc.
AS4DDR232M64PBG
FIGURE 12 - WRITE COMMAND
CK#
CK
CKE
CS#
HIGH
RAS#
CAS#
WE#
ADDRESS
A10
CA
EN AP
DIS AP
BANK ADDRESS
BA
DON’T CARE
Note: CA = column address; BA = bank address; EN AP = enable auto precharge; and
DIS AP = disable auto precharge.
TABLE 4 - WRITE USING CONCURRENTAUTO PRECHARGE
Minimum Delay (With Concurrent
From Command (Bank n )
To Command (Bank m )
Units
Auto Precharge)
(CL-1) + (BL/2) + tWTR
tCK
tCK
tCK
READ OR READ w/ AP
WRITE OR WRITE w/ AP
PRECHARGE or ACTIVE
WRITE with Auto Precharge
(BL/2)
1
Austin Semiconductor, Inc.
●
Austin, Texas
●
512.339.1188
●
www.austinsemiconductor.com
AS4DDR232M64PBG
Rev. 1.3 6/09
19