X28C512 Xicor, X28C512 Datasheet - Page 5

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

X28C512/X28C513
The Toggle Bit I/O
Figure 3a. Toggle Bit Bus Sequence
Figure 3b. Toggle Bit Software Flow
I/O 6
WE
OE
CE
WRITE
* Beginning and ending state of I/O 6 will vary.
LAST
FROM ADDR n
LOAD ACCUM
ACCUM WITH
LAST WRITE
COMPARE
COMPARE
X28C512
ADDR n
READY
OK?
6
YES
*
NO
V OH
3856 FHD F10
V OL
5
The Toggle Bit can eliminate the software housekeeping
chore of saving and fetching the last address and data
written to a device in order to implement DATA Polling.
This can be especially helpful in an array comprised of
multiple X28C512/513 memories that is frequently up-
dated. Toggle Bit Polling can also provide a method for
status checking in multiprocessor applications. The
timing diagram in Figure 3a illustrates the sequence of
events on the bus. The software flow diagram in Figure
3b illustrates a method for polling the Toggle Bit.
HIGH Z
*
X28C512/513
READY
3856 FHD F09.1