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DP8500 Datasheet(PDF) 31 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP8500
Description  DP8520A/DP8521A/DP8522A microCMOS Programmable 256k/1M/4M Video RAM Controller/Drivers
PDF  70 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8500 Datasheet(HTML) 31 Page - National Semiconductor (TI)

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70 Additional Access Support Features
73 DELAY CAS DURING WRITE ACCESSES
Address bit C9 asserted during programming will cause CAS
to be delayed until the first positive edge of CLK after RAS
is asserted when the input WIN is asserted Delaying CAS
during write accesses ensures that the data to be written to
VRAM will be setup to CAS asserting as shown in
Figures
34 and 35 If the possibility exists that data still may not be
present after the first positive edge of CLK CAS can be
delayed further with the ECAS inputs If address bit C9 is
negated during programming read and write accesses will
be treated the same (with regard to CAS)
TLF9338 – 85
FIGURE 34 Mode 0 Delay CAS
TLF9338 – 86
FIGURE 35 Mode 1 Delay CAS
31



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