Document Number: 002-00886 Rev. *B
S29GL01GP
S29GL512P
S29GL256P
S29GL128P
Figure 8.3
Lock Register Program Algorithm
Write Unlock Cycles:
Address 555h, Data AAh
Address 2AAh, Data 55h
Write
Enter Lock Register Command:
Address 555h, Data 40h
Program Lock Register Data
Address XXXh, Data A0h
Address XXXh*, Data PD
Unlock Cycle 1
Unlock Cycle 2
XXXh = Address don’t care
Program Data (PD): See text for Lock Register definitions
Caution:
Lock register can only be progammed once.
PASS. Write Lock Register
Exit Command:
Address XXXh, Data 90h
Address XXXh, Data 00h
Device returns to reading array.
Perform Polling Algorithm
(see Write Operation Status
flowchart)
Yes
Yes
No
No
Done?
DQ5 = 1?
Error condition (Exceeded Timing Limits)
FAIL. Write rest command
to return to reading array.
