S29GL-P Datasheet, PDF (44/71 Pages) SPANSION – 3.0 Volt-only Page Mode Flash Memory featuring 90 nm MirrorBit Process Technology

Data Sheet (Advance Information)
Figure 8.3 Lock Register Program Algorithm
Write Unlock Cycles:
Address 555h, Data AAh
Address 2AAh, Data 55h
Unlock Cycle 1
Unlock Cycle 2
Write
Enter Lock Register Command:
Address 555h, Data 40h
Program Lock Register Data
Address XXXh, Data A0h
Address XXXh*, Data PD
XXXh = Address don’t care
Program Data (PD): See text for Lock Register definitions
Caution: Lock register can only be progammed once.
Wait 4 ms
(Recommended)
Perform Polling Algorithm
(see Write Operation Status
flowchart)
Yes
Done?
No
DQ5 = 1?
No
Yes
Error condition (Exceeded Timing Limits)
PASS. Write Lock Register
Exit Command:
Address XXXh, Data 90h
Address XXXh, Data 00h
Device returns to reading array.
FAIL. Write rest command
to return to reading array.
42
S29GL-P MirrorBit^TM Flash Family
S29GL-P_00_A3 November 21, 2006