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X28C256DM Folha de dados(PDF) 5 Page - Xicor Inc.

Nome de Peças X28C256DM
Descrição Electrónicos  5 Volt, Byte Alterable E2PROM
PDF  24 Pages
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Fabricante Electrônico  XICOR [Xicor Inc.]
Página de início  http://www.xicor.com
Logo XICOR - Xicor Inc.

X28C256DM Folha de dados(HTML) 5 Page - Xicor Inc.

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X28C256
5
THE TOGGLE BIT I/O6
Figure 4. Toggle Bit Bus Sequence
CE
OE
WE
I/O6
X28C256
READY
VOH
VOL
LAST
WRITE
HIGH Z
* Beginning and ending state of I/O6 will vary.
*
*
3855 FHD F14
Figure 5. Toggle Bit Software Flow
3855 FHD F15
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 X28C256 memories that is frequently updated.
The timing diagram in Figure 4 illustrates the sequence
of events on the bus. The software flow diagram in
Figure 5 illustrates a method for polling the Toggle Bit.
LOAD ACCUM
FROM ADDR n
COMPARE
ACCUM WITH
ADDR n
X28C256
READY
COMPARE
OK?
NO
YES
LAST WRITE



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