X28LC512 데이터 시트보기 (PDF) - Xicor -> Intersil
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X28LC512 Datasheet PDF : 19 Pages
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X28LC512/X28LC513
DATA Polling I/O7
Figure 2a. DATA Polling Bus Sequence
LAST
WE WRITE
CE
OE
VIH
I/O7
A0–A15
An
HIGH Z
VOL
An
An
An
Figure 2b. DATA Polling Software Flow
WRITE DATA
VOH
X28LC512
READY
An
An
An
3005 ILL F12
DATA Polling can effectively halve the time for writing to
the X28LC512/513. The timing diagram in Figure 2a
illustrates the sequence of events on the bus. The
software flow diagram in Figure 2b illustrates one method
of implementing the routine.
WRITES
NO
COMPLETE?
YES
SAVE LAST DATA
AND ADDRESS
READ LAST
ADDRESS
IO7
NO
COMPARE?
YES
X28LC512
READY
3005 ILL F13
4
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