MO SEL VITELIC
V53C517405A
Waveforms of CAS-before-RAS Refresh Counter Test Cycle
t
t
RAS
RP
Read Cycle:
RAS
VIH
VIL
t
RSH
t
t
t
CP
CSB
CHR
t
CAS
VIH
VIL
CAS
t
RAL
t
ASR
t
t
ASC
CAH
VIH
VIL
Address
WE
Column
Row
t
WRP
t
t
RRH
CAA
t
RCH
VIH
VIL
t
CAC
t
WRH
t
t
RCS
OEA
VIH
VIL
OE
t
DZC
t
CDD
t
I/O
(Inputs)
VIH
VIL
ODD
t
t
DZO
OFF
t
t
CLZ
OEZ
VOH
VOL
I/O
(Outputs)
Data
Out
t
WCS
t
WRP
t
RWL
Write Cycle:
WE
t
CWL
WCH
VIH
VIL
t
t
WRH
VIH
VIL
OE
t
t
DS
DH
I/O
(Inputs)
VIH
VIL
Data In
I/O
(Outputs)
VIH
VIL
HI-Z
V53C517405A Rev. 1.1 March 1998
20