X28C64DI datasheet(8/25 Pages) XICOR

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X28C64

Resetting Software Data Protection

Figure 8. Reset Software Data Protection Timing Sequence

3853 FHD F18.1

Figure 9. Software Sequence to Deactivate

Software Data Protection

In the event the user wants to deactivate the software

data protection feature for testing or reprogramming in

an E2PROM programmer, the following six step algo-

rithm will reset the internal protection circuit. After tWC,

the X28C64 will be in standard operating mode.

Note:

Once initiated, the sequence of write opera-

tions should not be interrupted.

WRITE DATA 55

TO ADDRESS

0AAA

3853 ILL F19.2

WRITE DATA 55

TO ADDRESS

0AAA

WRITE DATA 80

TO ADDRESS

1555

WRITE DATA AA

TO ADDRESS

1555

WRITE DATA 20

TO ADDRESS

1555

WRITE DATA AA

TO ADDRESS

1555

STANDARD

OPERATING

MODE

VCC

DATA

ADDRESS

1555

0AAA

1555

≥t

1555

0AAA

1555

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