參數(shù)資料
型號(hào): μPD45D128842
廠商: NEC Corp.
英文描述: 128 M-bit Synchronous DRAM with Double Data Rate(128 同步動(dòng)態(tài)RAM)
中文描述: 128 M位同步雙數(shù)據(jù)速率(128同步動(dòng)態(tài)RAM的內(nèi)存)
文件頁數(shù): 16/80頁
文件大?。?/td> 637K
代理商: ΜPD45D128842
16
μ
PD45D128442, 45D128842, 45D128164
Preliminary Data Sheet
4. Truth Table
4.1 Command Truth Table
Function
Symbol
CKE
/CS
/RAS
/CAS
/WE
Address
n-1
n
BA0 BA1
A10
A0-7,A11
Device deselect
DESL
H
x
H
x
x
x
x
x
x
No operation
NOP
H
x
L
H
H
H
x
x
x
Burst stop
BST
H
x
L
H
H
L
x
x
x
Read
READ
H
x
L
H
L
H
V
L
V
Read with auto precharge
READA
H
Write
WRIT
H
x
L
H
L
L
V
L
V
Write with auto precharge
WRITA
H
Bank active
ACT
H
x
L
L
H
H
V
Prechrage select bank
PRE
H
x
L
L
H
L
V
L
x
Precharge all banks
PALL
x
H
x
Mode register set
MRS
H
x
L
L
L
L
L
L
L
V
Extended mode register set
EMRS
H
L
L
V
4.2 DM Truth Table
CKE
DM
Function
Symbol
n-1
n
U
L
Data write enable
ENB
H
x
L
Data mask
MASK
H
x
H
Upper byte write enable
ENBU
H
x
L
x
Lower byte write enable
ENBL
H
x
x
L
Upper byte write inhibit
MASKU
H
x
H
x
Lower byte write inhibit
MASKL
H
x
x
H
4.3 CKE Truth Table
Current State
Function
Symbol
CKE
/CS
/RAS
/CAS
/WE
Address
n-1
n
Idle
CBR (auto) refresh command
REF
H
H
L
L
L
H
x
Idle
Self refresh entry
SELF
H
L
Self refresh
Self refresh exit
SREX
L
H
x
x
x
x
x
Idle
Power down entry
PWDN
H
L
x
x
x
x
x
Power down
Power down exit
PDEX
L
H
x
x
x
x
x
Remark
H = High level, L = Low level, V = Valid, x = High or Low level (Don't care)
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