VG36643241BT-10 Ver la hoja de datos (PDF) - Vanguard International Semiconductor
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VG36643241BT-10 Datasheet PDF : 72 Pages
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VIS
Preliminary
VG3664321(4)1(2)BT
CMOS Synchronous Dynamic RAM
2.Truth Table
2.1 Command Truth Table
FUNCTION
CKE
Symbol n - 1 n
CS RAS CAS WE BA(1) A10 A9 - A0
Device deselect
DESL
HXH X
XXX
X
X
No operation
NOP
H X L H HHX
X
X
Mode register set
MRS
HXL
L
LL
L
L
V
Bank activate
ACT
HXL
L
HH V
V
V
Read
READ
HX
L
H
LHV
L
V
Read with auto precharge READA H X
L
H
LHV
H
V
Write
WRIT
HX
L
H
L
L
V
L
V
Write with auto precharge WRITA H X
L
H
LL
V
H
V
Precharge select bank
PRE
HX
L
L
HL
V
L
X
Precharge all banks
PALL
HXL
L
HL X
H
X
Burst stop
BST
HX L H HLX
X
X
CBR (Auto) refresh
REF
HHL
L
LHX
X
X
Self refresh
SELF
HLL
L
LHX
X
X
Notes : (1) Bank address. lt would be different from organizations.
2.2 DQM Truth Table
FUNCTION
Data write/output enable
Data mask/output disable
DQ24 ~ DQ31 write enable/output enable
DQ16 ~ DQ23 write enable/output enable
DQ8 ~ DQ7 write enable/output enable
DQ0 ~ DQ7 write enable/output enable
DQ24 ~ DQ31 write enable/output enable
DQ16 ~ DQ23 write enable/output enable
DQ8 ~ DQ15 write enable/output enable
DQ0 ~ DQ7 write enable/output enable
Symbol
ENB
MASK
ENB3
ENB2
ENB1
ENB0
MASK3
MASK2
MASK1
MASK0
CKE
n-1 n-1 3
H
X
H
X
H
X
L
H
X
X
H
X
X
H
X
X
H
X
H
H
X
X
H
X
X
H
X
X
DQM
2
1
0
L
H
X
X
X
L
X
X
X
L
X
XX
L
X
X
X
HX
X
XH X
X
H
2.3 CKE Truth Table
CKE
Current State
Function
Symbol n - 1 n
Activating
Clock suspend mode entry
H
L
Any
Clock suspend
L
L
Clock suspend Clock suspend mode exit
L
H
Idle
Idle
Self refresh
CBR refresh command
Self refresh entry
Self refresh exit
REF
H
H
SELF
H
L
L
H
L
H
Idle
Power down entry
H
L
Power down
Power down exit
L
H
H : High level, L : Low level
X : High or Low level (Don’t care), V : Valid Data input
Add
CS RAS CAS WE ress
X
X
X
XX
X
X
X
XX
X
X
X
XX
L
L
L
HX
L
L
L
HX
L
H
H
HX
H
X
X
XX
X
X
X
XX
X
X
X
XX
Document : 1G5-0099
Rev.1
Page 10
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