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W9812G2KB Datasheet(PDF) 13 Page - Winbond

Part # W9812G2KB
Description  1M X 4 BANKS X 32 BITS SDRAM
PDF  43 Pages
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W9812G2KB Datasheet(HTML) 13 Page - Winbond

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W9812G2KB
Publication Release Date: Jun. 20, 2014
- 13 -
Revision: A01
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
RAS
CAS
WE
Bank Active
Idle
H
x
x
v
v
V
L
L
H
H
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
Idle
H
x
x
v
v
v
L
L
L
L
No-Operation
Any
H
x
x
x
x
x
L
H
H
H
Burst Stop
Active (4)
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
L
H
H
x
x
x
x
x
x
x
x
H
L
x
H
x
H
x
x
Clock suspend Mode
Entry
Active
H
L
x
x
x
x
x
x
x
x
Power Down Mode Entry
Idle
Active (5)
H
H
L
L
x
x
x
x
x
x
x
x
H
L
x
H
x
H
X
H
Clock Suspend Mode Exit
Active
L
H
x
x
x
x
x
x
x
X
Power Down Mode Exit
Any
(Power
Down)
L
L
H
H
x
x
x
x
x
x
x
x
H
L
x
H
x
H
X
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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