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DP8500 Datasheet(PDF) 14 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) 14 Page - National Semiconductor (TI)

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40 Refresh Options (Continued)
TLF9338 – 10
Explanation of Terms
RFRQ e
ReFresh ReQuest internal to the DP8520A21A22A
RFRQ has the ability to hold off a pending access
RFSH e
Externally requested ReFreSH
RFIP e
ReFresh In Progress
ACIP e
Port A or Port B (DP8522A only) ACcess In Progress
This means that either RAS is low for an access or is
in the process of transitioning low for an access
FIGURE 7a DP8520A21A22A AccessRefresh Arbitration State Program
TLF9338 – 11
FIGURE 7b Single External Refresh (2 Periods of RAS Low during Refresh Programmed)
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