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SMJ44C251 Datasheet, PDF (26/53 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM | |||
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SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A â MARCH 1995 â REVISED JUNE 1995
PARAMETER MEASUREMENT INFORMATION
RAS
tw(RL)
tc(W)
CAS
A0 â A8
tt
td(RLCL)
td(RLCH)
td(CLRH)
tsu(RA)
th(RA)
th(RLCA)
tsu(CA)
tw(CL)
th(CLCA)
Row
Column
tsu(SFR)
th(SFR)
DSF
1
tsu(SFC)
th(SFC)
2
tsu(TRG)
TRG
th(TRG)
tsu(WMR)
th(RWM)
W
3
tsu(WCH)
tsu(WRH)
th(RLW)
tsu(WCL)
th(CLW)
tw(RH)
tt
td(CHRL)
tw(CH)
tsu(DQR)
th(RDQ)
tsu(DCL)
DQ0 â DQ3
4
tw(WL)
th(CLD)
th(RLD)
5
Figure 14. Early-Write-Cycle Timing
Table 4. Write-Cycle State Table
CYCLE
Write operation
Write-mask load/use, write DQs to I/Os
Use previous write mask, write DQs to I/Os
Load write mask on later of W fall and CAS fall
1
2
L
L
L
L
H
L
H
L
STATE
3
H
L
L
H
4
Donât care
Write mask
Donât care
Donât care
5
Valid data
Valid data
Valid data
Write mask
26
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