W9864G6DB Datasheet, PDF (12/48 Pages) Winbond – 1M x 4 BANKS x 16 BITS SDRAM

W9864G6DB
Table of Operating Modes
Fully synchronous operations are performed to latch the commands at the positive edges of CLK.
Table 1 shows the truth table for the operation commands.
TABLE 1 TRUTH TABLE (Note (1), (2))
COMMAND
DEVICE
STATE
CKEn-1 CKEn DQM BS0, 1 A10 A0−A9 _CS
Bank Active
Idle
H
x
x
v
v
V
L
Bank Precharge
Any
H
x
x
v
L
x
L
Precharge All
Any
H
x
x
x
H
x
L
Write
Active (3)
H
x
x
v
L
v
L
Write with Auto Precharge Active (3)
H
x
x
v
H
v
L
Read
Active (3)
H
x
x
v
L
v
L
Read with Auto Precharge Active (3)
H
x
x
v
H
v
L
Mode Register Set
Idle
H
x
x
v
v
v
L
No-Operation
Any
H
x
x
x
x
x
L
Burst Stop
Active (4)
H
x
x
x
x
x
L
Device Deselect
Any
H
x
x
x
x
x
H
Auto Refresh
Idle
H
H
x
x
x
x
L
Self Refresh Entry
Idle
H
L
x
x
x
x
L
Self Refresh Exit
idle
(S.R)
L
H
x
x
x
x
H
L
H
x
x
x
x
L
Clock Suspend Mode
Entry
Active
H
L
x
x
x
x
x
Idle
H
Power Down Mode Entry
Active (5)
H
L
x
x
x
x
H
L
x
x
x
x
L
Clock Suspend Mode Exit Active
L
H
x
x
x
x
x
Any
L
H
x
x
x
x
H
Power Down Mode Exit
(power
down)
L
H
x
x
x
x
L
Data Write/Output Enable
Active
H
x
L
x
x
x
x
Data Write/Output Disable Active
H
x
H
x
x
x
x
Notes:
(1) v = valid, x = Don't care, L = Low Level, H = High Level
(2) CKEn signal is input leve l when commands are provided.
(3) These are state of bank designated by BS0, BS1 signals.
(4) Device state is full page burst operation.
(5) Power Down Mode can not be entered in the burst cycle.
When this command asserts in the burst cycle, device state is clock suspend mode.
RAS CAS WE
L
H
H
L
H
L
L
H
L
H
L
L
H
L
L
H
L
H
H
L
H
L
L
L
H
HH
H
H
L
x
x
x
L
L
H
L
L
H
x
x
x
H
H
x
x
x
x
x
x
X
H
HH
x
x
X
x
x
X
H
HH
x
x
x
x
x
x
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