x28c64 Intersil Corporation, x28c64 Datasheet - Page 4

• Manufacturer Part Number: x28c64
• Description: 5 Volt, Byte Alterable E2prom
• Manufacturer: Intersil Corporation

X28C64
DATA Polling I/O
Figure 2. DATA Polling Bus Sequence
Figure 3. DATA Polling Software Flow
A 0 –A 12
I/O 7
WE
CE
OE
SAVE LAST DATA
AND ADDRESS
WRITE
WRITE DATA
COMPLETE?
LAST
READ LAST
COMPARE?
7
ADDRESS
WRITES
V IH
An
X28C64
READY
IO 7
YES
YES
An
NO
NO
HIGH Z
An
3853 FHD F13
V OL
An
4
DATA Polling can effectively halve the time for writing to
the X28C64. The timing diagram in Figure 2 illustrates
the sequence of events on the bus. The software flow
diagram in Figure 3 illustrates one method of implement-
ing the routine.
An
An
An
V OH
X28C64
READY
3853 FHD F12