X28HT010 datasheet(7/20 Pages) RENESAS

7 / 20 page

X28C010, X28HT010

FN8105 Rev 1.00

Page 7 of 20

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

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