X28C512 Xicor, X28C512 Datasheet - Page 4

• Manufacturer Part Number: X28C512
• Description: 5 Volt/ Byte Alterable E2PROM
• Manufacturer: Xicor

X28C512/X28C513
DATA Polling I/O
Figure 2a. DATA Polling Bus Sequence
Figure 2b. DATA Polling Software Flow
A 0 –A 15
I/O 7
WE
OE
CE
SAVE LAST DATA
AND ADDRESS
WRITE
LAST
WRITE DATA
COMPLETE?
READ LAST
COMPARE?
ADDRESS
V IH
An
X28C512
WRITES
7
READY
IO 7
YES
YES
An
NO
NO
HIGH Z
3856 FHD F08
An
V OL
An
4
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.
An
An
An
V OH
X28C512/513
READY
3856 FHD F07.1