W9812G2IB Datasheet, PDF (12/43 Pages) Winbond – 1M × 4 BANKS × 32BITS SDRAM

W9812G2IB
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
A11
CS
Bank Active
Idle
H
Bank Precharge
Any
H
Precharge All
Any
H
Write
Active ⁽³⁾
H
Write with Auto-precharge Active ⁽³⁾
H
Read
Active ⁽³⁾
H
Read with Auto-precharge Active ⁽³⁾
H
Mode Register Set
Idle
H
No – Operation
Burst Stop
Any
H
Active ⁽⁴⁾
H
Device Deselect
Any
H
Auto - Refresh
Idle
H
Self - Refresh Entry
Idle
H
Self Refresh Exit
idle
L
(S.R.)
L
Clock suspend Mode Entry Active
H
Idle Active ⁽⁵⁾ H
Power Down Mode Entry
H
Clock Suspend Mode Exit
Active
L
Power Down Mode Exit
Any
L
(power down) _L
x
x
v
v
v
L
x
x
v
L
x
L
x
x
x
H
x
L
x
x
v
L
v
L
x
x
v
H
v
L
x
x
v
L
v
L
x
x
v
H
v
L
x
x
v
v
v
L
x
x
x
x
x
L
x
x
x
x
x
L
x
x
x
x
x
H
H
x
x
x
x
L
L
x
x
x
x
L
H
x
x
x
x
H
H
x
x
x
x
L
L
x
x
x
x
x
L
x
x
x
x
H
L
x
x
x
x
L
H
x
x
x
x
x
H
x
x
x
x
H
H
x
x
x
x
L
RAS CAS WE
L HH
LHL
LHL
HL L
HL L
HLH
HLH
LLL
HHH
HH L
x
x
x
L LH
L LH
x
x
x
HH x
x
x
x
x
x
x
HH x
x
x
x
x
x
x
HH x
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 level when commands are provided.
CKEn-1 signal is the input level one clock cycle before the command is issued.
(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: Mar. 09, 2010
Revision A04