X28HT010 datasheet(7/20 Pages) INTERSIL

7 / 20 page

FN8105.1

February 12, 2007

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 X28C010/X28HT010

will automatically disable further writes unless another

command is issued to cancel it. If no further commands are

issued the X28C010/X28HT010 will be write protected

during power-down and after any subsequent power-up. The

state of A15 and A16 while executing the algorithm is don’t

care.

Note: Once initiated, the sequence of write operations

should not be interrupted.

(VCC)

Write

Protected

VCC

Data

Addr

5555

2AAA

5555

≤ tBLC MAX

Writes

Byte

Page

tWC

FIGURE 6. TIMING SEQUENCE—BYTE OR PAGE WRITE

Write Last

Byte

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 Operation

Optional

FIGURE 7. WRITE SEQUENCE FOR SOFTWARE DATA

PROTECTION

X28C010, X28HT010

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