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AD484M1644VTA-15 датащи(PDF) 10 Page - List of Unclassifed Manufacturers

номер детали AD484M1644VTA-15
подробное описание детали  Ascend Semiconductor Corporation(64Mb SDRAM)
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производитель  ETC [List of Unclassifed Manufacturers]
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Logo ETC - List of Unclassifed Manufacturers

AD484M1644VTA-15 датащи(HTML) 10 Page - List of Unclassifed Manufacturers

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


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