參數(shù)資料
型號: μPD4564323
廠商: NEC Corp.
英文描述: 64M-bit Synchronous DRAM(64M 同步動態(tài)RAM)
中文描述: 6400位同步DRAM(6400同步動態(tài)RAM)的
文件頁數(shù): 13/82頁
文件大小: 659K
代理商: ΜPD4564323
13
μ
PD4564323
Preliminary Data Sheet
4. Truth Table
4.1 Command Truth Table
Function
Symbol
CKE
/CS
/RAS
/CAS
/WE
BA0,
A10
A9 - A0
n – 1
n
BA1
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
Remark
H = High level, L = Low level,
×
= High or Low level (Don't care), V = Valid data input
4.2 DQM Truth Table
Function
Symbol
CKE
DQM
n-1
n
0
1
2
3
Data write/output enable
ENB
H
×
L
Data mask/output disable
MASK
H
×
H
DQ0 - DQ7 write enable/output enable
ENB0
H
×
L
×
×
×
DQ8 - DQ15 write enable/output enable
ENB1
H
×
×
L
×
×
DQ16 - DQ23 write enable/output enable
ENB2
H
×
×
×
L
×
DQ24 - DQ31 write enable/output enable
ENB3
H
×
×
×
×
L
DQ0 - DQ7 write inhibit/output disable
MASK0
H
×
H
×
×
×
DQ8 - DQ15 write inhibit/output disable
MASK1
H
×
×
H
×
×
DQ16 - DQ23 write inhibit/output disable
MASK2
H
×
×
×
H
×
DQ24 - DQ31 write inhibit/output disable
MASK3
H
×
×
×
×
H
Remark
H = High level, L = Low level,
×
= High or Low level (Don't care)
4.3 CKE Truth Table
Current state
Function
Symbol
CKE
/CS
/RAS
/CAS
/WE
Address
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
×
×
×
×
×
Remark
H = High level, L = Low level,
×
= High or Low level (Don't care)
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