參數(shù)資料
型號(hào): μPD4516161A
廠商: NEC Corp.
英文描述: 16M-bit Synchronous DRAM(16M 同步動(dòng)態(tài)RAM)
中文描述: 1,600位同步DRAM(1,600同步動(dòng)態(tài)RAM)的
文件頁(yè)數(shù): 15/86頁(yè)
文件大?。?/td> 904K
代理商: ΜPD4516161A
μ
PD4516421A, 4516821A, 4516161A for Rev. P
15
4. Truth Table
4.1 Command Truth Table
Function
Symbol
CKE
CS
RAS
CAS
WE
A11
A10
A9-
A0
n-1
n
Device deselect
DESL
H
×
H
×
×
×
×
×
×
No operation
NOP
H
×
L
H
H
H
×
×
×
Burst stop
BST
H
×
L
H
H
L
×
×
×
Read
READ
H
×
L
H
L
H
V
L
V
Read with auto precharge
READA
H
×
L
H
L
H
V
H
V
Write
WRIT
H
×
L
H
L
L
V
L
V
Write with auto precharge
WRITA
H
×
L
H
L
L
V
H
V
Bank activate
ACT
H
×
L
L
H
H
V
V
V
Precharge select bank
PRE
H
×
L
L
H
L
V
L
×
Precharge all banks
PALL
H
×
L
L
H
L
×
H
×
Mode register set
MRS
H
×
L
L
L
L
L
L
V
4.2 DQM Truth Table
Function
Symbol
CKE
DQM
n-1
n
U
L
Data write/output enable
ENB
H
×
L
Data mask/output disable
MASK
H
×
H
Upper byte write enable/output enable
ENBU
H
×
L
×
Lower byte write enable/output enable
ENBL
H
×
×
L
Upper byte write inhibit/output disable
MASKU
H
×
H
×
Lower byte write inhibit/output disable
MASKL
H
×
×
H
4.3 CKE Truth Table
Current state
Function
Symbol
CKE
CS
RAS
CAS
WE
Add-
ress
n-1
n
Activating
Clock suspend mode entry
H
L
×
×
×
×
×
Any
Clock suspend
L
L
×
×
×
×
×
Clock suspend
Clock suspend mode exit
L
H
×
×
×
×
×
Idle
CBR refresh command
REF
H
H
L
L
L
H
×
Idle
Self refresh entry
SELF
H
L
L
L
L
H
×
Self refresh
Self refresh exit
L
H
L
H
H
H
×
L
H
H
×
×
×
×
Idle
Power down entry
H
L
×
×
×
×
×
Power down
Power down exit
L
H
×
×
×
×
×
H: High level, L: Low level
×
: High or Low level (Don’t care), V: Valid Data input
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