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參數資料
型號: W942516CH
廠商: WINBOND ELECTRONICS CORP
英文描述: 4M X 4 BANKS X 16 BIT DDR SDRAM
中文描述: 4米× 4銀行× 16位DDR SDRAM
文件頁數: 15/47頁
文件大?。?/td> 2809K
代理商: W942516CH
W942516CH
Publication Release Date: May 20, 2003
- 15 -
Revision A2
8. OPERATION MODE
The following table shows the operation commands.
8.1 Simplified Truth Table
SYM.
COMMAND
DEVICE
STATE
CKEN-1
CKEN
DM
(4)
BS0,
BS1
A10
A12,
A11,
A9-A0
CS
RAS
CAS
WE
ACT
Bank Active
Idle
(3)
H
X
X
V
V
V
L
L
H
H
PRE
Bank Precharge
Any
(3)
H
X
X
V
L
X
L
L
H
L
PREA
Precharge All
Any
H
X
X
X
H
X
L
L
H
L
WRIT
Write
Active
(3)
H
X
X
V
L
V
L
H
L
L
WRITA
Write with Auto
Precharge
Active
(3)
H
X
X
V
H
V
L
H
L
L
READ
Read
Active
(3)
H
X
X
V
L
V
L
H
L
H
READA
Read with Auto
Precharge
Active
(3)
H
X
X
V
H
V
L
H
L
H
MRS
Mode Register
Set
Idle
H
X
X
L, L
C
C
L
L
L
L
EMRS
Extended Mode
Regiser Set
Idle
H
X
X
H, L
V
V
L
L
L
L
NOP
No Operation
Any
H
X
X
X
X
X
L
H
H
H
BST
Burst Read Stop
Active
H
X
X
X
X
X
L
H
H
L
DSL
Device Deselect
Any
H
X
X
X
X
X
H
X
X
X
AREF
Auto Refresh
Idle
H
H
X
X
X
X
L
L
L
H
SELF
Self Refresh
Entry
Idle
H
L
X
X
X
X
L
L
L
H
H
X
X
X
SELEX
Self Refresh Exit
Idle
(Self
Refresh)
L
H
X
X
X
X
L
H
H
X
H
X
X
X
PD
Power Down
Dode Entry
Idle/
Active
(5)
H
L
X
X
X
X
L
H
H
X
H
X
X
X
PDEX
Power Down
Mode Exit
Any
(Power
Down)
L
H
X
X
X
X
L
H
H
X
WDE
Data Write
Enable
Active
H
X
L
X
X
X
X
X
X
X
WDD
Data Write
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. CKE
n
signal is input level when commands are issued.
CKE
n-1
signal is input level one clock cycle before the commands are issued.
4. These are state designated by the BS0, BS1 signals.
5. LDM, UDM (W942516CH)
6. Power Down Mode can not entry in the burst cycle.
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