X28C64DI datasheet(7/25 Pages) XICOR

7 / 25 page

X28C64

WRITE LAST

BYTE TO

LAST ADDRESS

3853 FHD F17

WRITE DATA 55

TO ADDRESS

0AAA

WRITE DATA A0

TO ADDRESS

1555

WRITE DATA XX

TO ANY

ADDRESS

AFTER tWC

RE-ENTERS DATA

PROTECTED STATE

WRITE DATA AA

TO ADDRESS

1555

BYTE/PAGE

LOAD ENABLED

Software Data Protection

Figure 6. Timing Sequence—Byte or Page Write

3853 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 X28C64

will automatically disable further writes unless another

command is issued to cancel it. If no further commands

are issued the X28C64 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.

3853 FHD F17

(VCC)

WRITE

PROTECTED

VCC

DATA

ADDRESS

1555

0AAA

1555

≤t

BLC MAX

WRITES

BYTE

PAGE

tWC

tWPH2

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