28C256 查看數據表（PDF） - Xicor -> Intersil
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28C256 Datasheet PDF : 24 Pages
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X28C256
DATA POLLING I/O7
Figure 2. DATA Polling Bus Sequence
LAST
WE WRITE
CE
OE
VIH
I/O7
HIGH Z
VOL
A0–A14
An
An
An
An
An
VOH
X28C256
READY
An
An
3855 FHD F12
Figure 3. DATA Polling Software Flow
WRITE DATA
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.
WRITES
NO
COMPLETE?
YES
SAVE LAST DATA
AND ADDRESS
READ LAST
ADDRESS
IO7
NO
COMPARE?
YES
X28C256
READY
3855 FHD F13
4
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