XM28C040 查看數據表（PDF） - Xicor -> Intersil
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XM28C040 Datasheet PDF : 17 Pages
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XM28C040
DATA POLLING I/O7
Figure 2. DATA Polling Bus Sequence
LAST
WE WRITE
CE
OE
VIH
I/O7
HIGH Z
VOL
A0–A18
An
An
An
An
An
VOH
READY
An
An
3873 FHD F10
Figure 3. DATA Polling Software Flow
WRITE DATA
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.
WRITES
NO
COMPLETE?
YES
SAVE LAST DATA
AND ADDRESS
READ LAST
ADDRESS
IO7
NO
COMPARE?
YES
READY
3873 FHD F11
4
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