W9864G2IB Datasheet, PDF (12/42 Pages) Winbond – 512K × 4 BANKS × 32BITS SDRAM

W9864G2IB
8. OPERATION MODE
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 RAS CAS WE}
Bank Active
Idle
H
x
x
v
v
V
L
L
HH
Bank Precharge
Any
H
x
x
v
L
x
L
L
H
L
Precharge All
Any
H
x
x
x
H
x
L
L
H
L
Write
Active ⁽³⁾
H
x
x
v
L
v
L
H
L
L
Write with Auto-precharge Active ⁽³⁾
H
x
x
v
H
v
L
H
L
L
Read
Active ⁽³⁾
H
x
x
v
L
v
L
H
L
H
Read with Auto-precharge Active ⁽³⁾
H
x
x
v
H
v
L
H
L
H
Mode Register Set
No-Operation
Burst Stop
Idle
Any
Active ⁽⁴⁾
H
x
x
v
v
v
L
L
L
L
H
x
x
x
x
x
L
H
HH
H
x
x
x
x
x
L
H
H
L
Device Deselect
Any
H
x
x
x
x
x
H
x
x
x
Auto-Refresh
Idle
H
H
x
x
x
x
L
L
L
H
Self-Refresh Entry
Idle
H
L
x
x
x
x
L
L
L
H
Self Refresh Exit
idle
(S.R)
L
H
x
x
x
x
H
x
x
x
L
H
x
x
x
x
L
H
H
x
Clock suspend Mode
Entry
Active
H
L
x
x
x
x
x
x
x
x
Idle
H
L
x
x
x
x
H
x
x
X
Power Down Mode Entry
Active ⁽⁵⁾
H
L
x
x
x
x
L
H
H
H
Clock Suspend Mode Exit Active
L
H
x
x
x
x
x
x
x
X
Power Down Mode Exit
Any
(power
down)
L
H
x
x
x
x
H
x
x
X
L
H
x
x
x
x
L
H
H
H
Data write/Output Enable
Active
H
x
L
x
x
x
x
x
x
x
Data Write/Output Disable Active
H
x
H
x
x
x
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.
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Publication Release Date: Sep. 17, 2009
Revision A01