X28VC256DM-90 datasheet(8/24 Pages) XICOR

8 / 24 page

X28VC256

Figure 9. Write Sequence for Resetting

Software Data Protection

RESETTING SOFTWARE DATA PROTECTION

Figure 8. Reset Software Data Protection Timing Sequence

3869 FHD F18

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 X28VC256 will be in standard operating mode.

Note:

Once initiated, the sequence of write operations

should not be interrupted.

3869 FHD F19

STANDARD

OPERATING

MODE

VCC

DATA

ADDRESS

5555

2AAA

5555

tWC

5555

2AAA

5555

WRITE DATA 55

TO ADDRESS

2AAA

WRITE DATA 55

TO ADDRESS

2AAA

WRITE DATA 80

TO ADDRESS

5555

WRITE DATA AA

TO ADDRESS

5555

WRITE DATA 20

TO ADDRESS

5555

WRITE DATA AA

TO ADDRESS

5555

AFTER tWC,

RE-ENTERS

UNPROTECTED

STATE

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