XM28C040 datasheet(7/17 Pages) XICOR

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XM28C040

SOFTWARE DATA PROTECTION

Figure 6. Timing Sequence—Byte or Page Write

3873 FHD F14

Figure 7. Write Sequence for

Software Data Protection

Regardless of whether the device has previously been

protected or not, once the software data protected

algorithm is used and data has been written, the device

will automatically disable further writes unless another

command is issued to cancel it. If no further commands

are issued the device will be write protected during

power-down and after any subsequent power-up.

3873 FHD F15

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

(VCC)

WRITE

PROTECTED

VCC

DATA

ADDR.

A0–A16*

5555

2AAA

5555

≤t

BLC MAX

WRITES

BYTE

PAGE

*A17 & A18 select one of four devices on the module.

tWC

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