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X28C64DI Datasheet(PDF) 4 Page - Xicor Inc. |
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X28C64DI Datasheet(HTML) 4 Page - Xicor Inc. |
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4 / 25 page  4 X28C64 DATA Polling I/O7 Figure 2. DATA Polling Bus Sequence CE OE WE I/O7 X28C64 READY LAST WRITE HIGH Z VOL VIH A0–A12 An An An An An An VOH An 3853 FHD F12 Figure 3. DATA Polling Software Flow DATA Polling can effectively halve the time for writing to the X28C64. The timing diagram in Figure 2 illustrates the sequence of events on the bus. The software flow diagram in Figure 3 illustrates one method of implement- ing the routine. 3853 FHD F13 WRITE DATA SAVE LAST DATA AND ADDRESS READ LAST ADDRESS IO7 COMPARE? X28C64 READY NO YES WRITES COMPLETE? NO YES |
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