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XM28C040M-25 Datasheet(PDF) 4 Page - Xicor Inc. |
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XM28C040M-25 Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 17 page XM28C040 4 DATA POLLING I/O 7 Figure 2. DATA Polling Bus Sequence Figure 3. DATA Polling Software Flow DATA Polling can effectively halve the time for writing to the XM28C040. 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. 3873 FHD F10 3873 FHD F11 CE OE WE I/O7 READY LAST WRITE HIGH Z VOL VIH A0–A18 An An An An An An VOH An WRITE DATA SAVE LAST DATA AND ADDRESS READ LAST ADDRESS IO7 COMPARE? READY NO YES WRITES COMPLETE? NO YES |
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