128Mb Synchronous DRAM
P2V28S20ATP-7,-75,-8 (4-BANK x 8,388,608-WORD x 4-BIT)
P2V28S30ATP-7,-75,-8 (4-BANK x 4,194,304-WORD x 8-BIT)
P2V28S40ATP-7,-75,-8 (4-BANK x 2,097,152-WORD x 16-BIT)
FUNCTION TRUTH TABLE
Current State /CS /RAS /CAS /WE Address
Command Action
IDLE
H
L
L
L
L
L
L
L
X
H
H
H
L
L
L
L
X
H
H
L
X
H
L
X
DESEL
NOP
NOP
X
NOP
TBST
ILLEGAL*2
ILLEGAL*2
Bank Active, Latch RA
NOP*4
BA
READ /
WRITE
X
H
L
BA, CA, A10
BA, RA
BA, A10
X
H
H
L
ACT
PRE /
PREA
H
L
REFA
MRS
Auto-Refresh*5
Mode Register Set*5
Op-Code,
L
Mode-Add
ROW
H
L
L
L
L
X
H
H
H
H
X
H
H
L
X
H
L
X
DESEL
NOP
NOP
NOP
NOP
ACTIVE
X
BA
TBST
Begin Read, Latch CA, Determine
Auto-Precharge
READ /
READA
WRITE /
WRITEA
H
L
BA, CA, A10
BA, CA, A10
BA, RA
Begin Write, Latch CA, Determine
Auto-Precharge
L
L
L
L
L
H
H
H
L
ACT
Bank Active / ILLEGAL*2
Precharge / Precharge All
PRE /
PREA
BA, A10
L
L
L
L
L
L
H
L
X
REFA
MRS
ILLEGAL
ILLEGAL
Op-Code,
Mode-Add
JULY.2000
Rev.2.2
Page-7
VML [ VANGUARD INTERNATIONAL SEMICONDUCTOR ]
