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DP8422A Datasheet(PDF) 40 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP8422A
Description  microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers
PDF  58 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8422A Datasheet(HTML) 40 Page - National Semiconductor (TI)

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100 Dual Accessing (DP8422A) (Continued)
TLF8588 – 29
FIGURE 34b Wait States during a Port B Access
1032 LOCK Input
When the LOCK input is asserted the currently granted port
can ‘‘lock out’’ the other port through the insertion of wait
states to that port’s access cycle LOCK does not disable
refreshes it only keeps GRANTB in the same state even if
the other port requests an access as shown in
Figure 35a
LOCK can be used by either port
TLF8588 – E8
FIGURE 35 LOCK Function
40



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