X28C512, X28C513
DATA Polling I/O 7
Last
WE
CE
OE
Write
I/O 7
V IH
H IGH   Z
V OL
V OH
X28C512, X28C513
Ready
A 0 -A 15
A n
A n
A n
A n
A n
A n
A n
FIGURE 2A. DATA POLLING BUS SEQUENCE
DATA Polling can effectively halve the time for writing to the
X28C512, X28C513. The timing diagram in Figure 2A
illustrates the sequence of events on the bus. The software
Write Data
Writes
Complete?
Yes
Save Last Data
and Address
Read Last
Address
IO 7
No
No
flow diagram in Figure 2B illustrates one method of
implementing the routine.
Compare?
Yes
Ready
FIGURE 2B. DATA POLLING SOFTWARE FLOW
6
FN8106.2
June 7, 2006
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