VIS
Truth Table
ADDRESSES
FUNCTION
STANDBY
READ
WRITE : (EARLY
WRITE)
READ WRITE
PAGE -
MODE READ
1st Cycle
2st
Cycle
RAS
H
L
L
L
L
L
L
L
L
L
L
→
H
→
L
L
→
H
→
L
VG26(V)(S)17400E
4,194,304 x 4 - Bit
CMOS Dynamic RAM
CAS
H
→
X
WE
X
H
L
H
→
L
OE
X
L
X
L
→
H
L
L
X
X
L
→
H
L
→
H
ROW
X
ROW
ROW
ROW
ROW
n/a
ROW
n/a
ROW
n/a
ROW
ROW
ROW
X
COL
X
High - Z
DQ
S
Notes
L
L
L
H
→
L
H
→
L
H
→
L
H
→
L
H
→
L
H
→
L
COL Data - Out
COL Data - In
COL Data - Out, Data - In
COL Data - Out
COL Data - Out
COL Data - In
COL Data - In
COL Data - Out, Data - In
COL Data - Out, Data - In
COL Data - Out
COL Data - In
n/a
X
High - Z
High - Z
1
H
H
L
L
H
→
L
H
→
L
PAGE -
1st Cycle
MODE WRITE
2st
Cycle
PAGE - MODE 1st Cycle
READ - WRITE
2st
Cycle
HIDDEN
REFRESH
READ
WRITE
L
L
H
L
H
L
X
H
L
X
X
X
RAS - ONLY REFRESH
CBR REFRESH
Notes : 1. EARLY WRITE only.
L
H
→
L
Document : 1G5-0142
Rev.1
Page 4
VML [ VANGUARD INTERNATIONAL SEMICONDUCTOR ]
