M29W128GH, M29W128GL
Figure 7. Lock Register program flowchart
Registers
START
Write Unlock cycles:
Add 555h, Data AAh
Add 2AAh, Data 55h
Unlock cycle 1
unlock cycle 2
Write
Enter Lock Register command set:
Add 555h, Data 40h
Program Lock Register Data:
Add Dont' care, Data A0h
(1)
Add Dont' care , Data PDh
Polling algorithm
YES
Done
NO
NO
DQ5 = 1
YES
PASS:
FAIL
Reset to return
the device to Read mode
Write Lock Register Exit command:
Add Dont' care, Data 90h
Device returned
to Read mode
Add Dont' care, Data 00h
ai13677
1. PD is the programmed data (see Table 18: Lock Register bits).
2. The Lock Register can only be programmed once.
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