SMJ44C251B Datasheet, PDF (46/53 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM

SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A – MARCH 1995 – REVISED JUNE 1995
PARAMETER MEASUREMENT INFORMATION
tw(RL)
tc( _TRD)
RAS
td(CHRL)
td(RLCA)
CAS
th(RA)
tsu(RA)
td(RLCL)
tsu(CA)
td(RLCH)
tw(CL)
td(CARH)
th(CLCA)
A0 – A8
Row
Tap Point A0 – A8
tw(RH)
tw(CH)
Don’t Care
tsu( _TRG)
th( _TRG)
tw(GH)
td( _THRH)
TRG
tsu(SFR)
th(SFR)
DSF
tsu( _WMR)
W
th(RWM)
Don’t Care
Don’t Care
DQ0 – DQ3
td(MSRL)
tw(SCH)
SC
Bit 255
or 511
SDQ0 – SDQ3
Bit 254 or
Bit 510
tc(SC)
tw(SCL)
ta(SQ)
th(SHSQ)
Bit 255 or
Bit 511
td(SCQSF)
QSF
Hi-Z
td(RHMS)
Tap
Point M
ta(SQ)
ta(SQ)
Tap Point M
tc(SC)
Bit 255
or 511
Bit 255 or
Bit 511
td(SCQSF)
Tap
Point N
tw(SCL)
Tap
Point N
ta(SQ)
Old MSB
New MSB
H
SE
L
Figure 34. Split-Register-Mode Read-Transfer-Cycle Timing
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