W78M32VP-XBX
FIGURE 11 – LOCK REGISTER PROGRAM ALGORITHM
Write Unlock Cycles:
Unlock Cycle 1
Address 555h, Data AAh
Unlock Cycle 2
Address 2AAh, Data 55h
Write
Enter Lock Register Command:
Address 555h, Data 40h
XXXh = Address don’t care
Program Lock Register Data
Program Data (PD): See text for Lock Register definitions
Address XXXh, Data A0h
Address XXXh*, Data PD
Caution: Lock register can only be progammed once.
Perform Polling Algorithm
(see Write Operation Status
flowchart)
Yes
Done?
No
No
DQ5 = 1?
Yes
Error condition (Exceeded Timing Limits)
PASS. Write Lock Register
Exit Command:
FAIL. Write rest command
to return to reading array.
Address XXXh, Data 90h
Address XXXh, Data 00h
Device returns to reading array.
Microsemi Corporation reserves the right to change products or specifications without notice.
August 2011 © 2011 Microsemi Corporation. All rights reserved.
Rev. 15
33
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