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X28C256KMB Datasheet(PDF) 4 Page - Xicor Inc. |
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X28C256KMB Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 24 page 4 X28C256 DATA POLLING I/O7 Figure 2. DATA Polling Bus Sequence Figure 3. DATA Polling Software Flow 3855 FHD F13 DATA Polling can effectively halve the time for writing to the X28C256. 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. 3855 FHD F12 CE OE WE I/O7 X28C256 READY LAST WRITE HIGH Z VOL VIH A0–A14 An An An An An An VOH An WRITE DATA SAVE LAST DATA AND ADDRESS READ LAST ADDRESS IO7 COMPARE? X28C256 READY NO YES WRITES COMPLETE? NO YES |
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