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DP8500 Datasheet(PDF) 27 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) 27 Page - National Semiconductor (TI)

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60 DP8520A21A22A Video RAM Support (Continued)
62 SUPPORT FOR VRAM ACCESS CYCLES THROUGH
PORT A USING THE DP8520A21A22A
With the DP8520A21A22A the output DT OE will remain
negated during write accesses (see
Figure 27 ) but during
read accesses it will assert after CASn asserts DT OE will
be negated for a read access once CASn is negated (see
Figure 28 ) causing the VRAM outputs to be enabled If
CASn toggles during a page mode read access then the
DT OE logic will also toggle following the CASn input
TLF9338 – 54
FIGURE 27 Video RAM Random Access Write Cycle
TLF9338 – 53
FIGURE 28 Video RAM Random Access Read Cycle
27



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