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X28HC256FMB-90 Datasheet(PDF) 4 Page - Xicor Inc. |
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X28HC256FMB-90 Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 24 page X28HC256 4 WRITE DATA SAVE LAST DATA AND ADDRESS READ LAST ADDRESS IO7 COMPARE? X28HC256 READY NO YES WRITES COMPLETE? NO YES DATA POLLING I/O7 Figure 2. DATA Polling Bus Sequence CE OE WE I/O7 X28HC256 READY LAST WRITE HIGH Z VOL VIH A0–A14 An An An An An An VOH An 3859 FHD F12 Figure 3. DATA Polling Software Flow DATA Polling can effectively halve the time for writing to the X28HC256. The timing diagram in Figure 2 illus- trates the sequence of events on the bus. The software flow diagram in Figure 3 illustrates one method of implementing the routine. 3859 FHD F13 |
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