X28C512 Datasheet, PDF (4/25 Pages) Xicor Inc. – 5 Volt, Byte Alterable E2PROM

X28C512/X28C513
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
WRITES
NO
COMPLETE?
YES
SAVE LAST DATA
AND ADDRESS
VOH
X28C512/513
READY
An
An
An
3856 FHD F07.1
DATA Polling can effectively halve the time for writing to
the X28C512/513. 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.
READ LAST
ADDRESS
IO7
NO
COMPARE?
YES
X28C512
READY
3856 FHD F08
4