X28VC256DM-90 datasheet(7/24 Pages) XICOR

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X28VC256

SOFTWARE DATA PROTECTION

Figure 6. Timing Sequence—Byte or Page Write

3869 FHD F16

Figure 7. Write Sequence for

Software Data Protection

Regardless of whether the device has previously been

protected or not, once the software data protection

algorithm is used and data has been written, the

X28VC256 will automatically disable further writes un-

less another command is issued to cancel it. If no further

commands are issued the X28VC256 will be write

protected during power-down and after any subsequent

power-up.

Note:

Once initiated, the sequence of write operations

should not be interrupted.

3869 FHD F17

(VCC)

WRITE

PROTECTED

VCC

DATA

ADDRESS

5555

2AAA

5555

≤t

BLC MAX

WRITES

BYTE

PAGE

tWC

≤t

BLC MAX

WRITE LAST

BYTE TO

LAST ADDRESS

WRITE DATA 55

TO ADDRESS

2AAA

WRITE DATA A0

TO ADDRESS

5555

WRITE DATA XX

TO ANY

ADDRESS

AFTER tWC

RE-ENTERS DATA

PROTECTED STATE

WRITE DATA AA

TO ADDRESS

5555

BYTE/PAGE

LOAD ENABLED

OPTIONAL

BYTE OR

PAGE WRITE

ALLOWED

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