W9425G6EH-5 Winbond Electronics, W9425G6EH-5 Datasheet - Page 18

• Manufacturer Part Number: W9425G6EH-5
• Description: IC DDR-400 SDRAM 256MB 66TSSOPII
• Manufacturer: Winbond Electronics

Specifications of W9425G6EH-5

• Format - Memory: RAM
• Memory Type: DDR SDRAM
• Memory Size: 256M (16Mx16)
• Speed: 250MHz
• Interface: Parallel
• Voltage - Supply: 2.3 V ~ 2.7 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 66-TSOPII
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8. OPERATION MODE
The following table shows the operation commands.
8.1
Notes :
ACT
PRE
PREA
WRIT
READ
READA
MRS
EMRS
NOP
BST
DSL
AREF
SELF
SELEX
PD
PDEX
WDE
WDD
WRITA
SYM.
1. V = Valid X = Don’t Care L = Low level H = High level
2. CKE
3. These are state designated by the BA0, BA1 signals.
4. LDM, UDM (W9425G6EH).
5. Power Down Mode can not entry in the burst cycle.
Simplified Truth Table
CKE
Mode Register Set
Self Refresh Entry
Data Write Enable
Data Write Disable
Bank Active
Bank Precharge
Precharge All
Write
Write with Auto-
precharge
Read
Read with Auto-
precharge
Extended Mode
Register Set
No Operation
Burst Read Stop
Device Deselect
Auto Refresh
Self Refresh Exit
Power Down
Mode Entry
Power Down
Mode Exit
n
n-1
signal is input level when commands are issued.
COMMAND
signal is input level one clock cycle before the commands are issued.
Any (Power
Idle (Self
Refresh)
DEVICE
Active
Active
Active
Active
Active
STATE
Active
Down)
Active
Active
Any
Idle
Idle/
Any
Any
Any
Idle
Idle
Idle
Idle
(3)
(3)
(3)
(3)
(3)
(3)
(5)
CKEn-1 CKEn
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
X
X
H
H
H
X
X
X
X
X
X
X
X
X
X
L
L
X
X
- 18 -
DM
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
L
(4)
BA0,
BA1
H, L
L, L
V
V
X
V
V
V
V
X
X
X
X
X
X
X
X
X
X
A10
Publication Release Date:Dec. 03, 2008
H
H
H
C
V
V
X
X
X
X
X
X
X
X
X
X
L
L
L
A9-A0
A12,
A11,
V
X
X
V
V
V
V
C
V
X
X
X
X
X
X
X
X
X
X
W9425G6EH
CS
H
H
H
H
X
X
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
RAS
H
H
H
H
H
H
X
X
H
X
H
X
H
X
X
L
L
L
L
L
L
L
Revision A08
CAS
H
H
H
H
H
H
H
H
X
X
X
X
X
X
L
L
L
L
L
L
L
L
WE
H
H
H
H
H
X
H
X
X
X
X
X
X
X
X
L
L
L
L
L
L
L