AD484M1644VTA-15 查看數據表（PDF） - Unspecified
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AD484M1644VTA-15 Datasheet PDF : 20 Pages
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Ascend Semiconductor Corporation 64Mb SDRAM
Truth Table
1. Command Truth Table ( AD484M1644VTA )
Command
Ignore Command
No operation
Burst stop
Read
Read with auto pre-charge
Write
Write with auto pre-charge
Bank activate
Pre-charge select bank
Pre-charge all banks
Mode register set
Symbol
DESL
NOP
BSTH
READ
READA
WRIT
WRITA
ACT
PRE
PALL
MRS
CKE
n-1
n
H
X
H
X
H
X
H
X
H
X
H
X
H
X
H
X
H
X
H
X
H
X
/CS
/RAS /CAS
/WE
BA0,
BA1
A10
A11,
A9~A0
H
X
X
X
X
X
X
L
H
H
H
X
X
X
L
H
H
L
X
X
X
L
H
L
H
V
L
V
L
H
L
H
V
H
V
L
H
L
L
V
L
V
L
L
H
H
V
H
V
L
L
H
H
V
V
V
L
L
H
L
V
L
X
L
L
H
L
X
H
X
L
L
L
L
L
L
V
Note : H = High level, L = Low level, X = High or Low level (Don't care), V = Valid data input
2. DQM Truth Table
Command
Symbol
CKE
/CS
n-1
n
Data write / output enable
ENB
H
Data mask / output disable
MASK
H
Upper byte write enable / output enable BSTH
H
Read
READ
H
Read with auto pre-charge
READA
H
Write
WRIT
H
Write with auto pre-charge
WRITA
H
Bank activate
ACT
H
Pre-charge select bank
PRE
H
Pre-charge all banks
PALL
H
Mode register set
MRS
H
X
H
X
L
X
L
X
L
X
L
X
L
X
L
X
L
X
L
X
L
X
L
Note : H = High level, L = Low level, X = High or Low level (Don't care), V = Valid data input
3. CKE Truth Table
Command
Command
Activating
Any
Clock suspend
Idle
Idle
Clock suspend mode entry
Clock suspend mode
Clock suspend mode exit
CBR refresh command
Self refresh entry
Self refresh
Self refresh exit
Idle
Power down
Power down entry
Power down exit
Symbol
REF
SELF
CKE
n-1 n
H
L
L
L
L
H
H
H
H
L
L
H
L
H
H
L
L
H
/CS /RAS /CAS /WE Addr.
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
L
L
H
X
L
L
L
H
X
L
H
H
H
X
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Remark H = High level, L = Low level, X = High or Low level (Don't care)
Preliminary
10
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