M58LW064C Datasheet, PDF (55/61 Pages) STMicroelectronics – 64 Mbit (4Mb x16, Uniform Block, Burst) 3V Supply Flash Memory

Figure 28. Block Unprotect Flowchart and Pseudo Code
M58LW064C
Start
Write 60h
Write D0h
Read Status Register
Block Unprotect Command
– write 60h, Block Adress
– write D0h, Block Adress
do:
– read status register
b7 = 1
NO
YES
b3 = 1
YES
NO
Invalid Voltage
Error
YES
b4, b5 = 1,1
NO
Invalid Command
Sequence Error
b5 = 1
NO
YES
Block Unprotect
Error
Write FFh
Block Unprotect
Sucessful
while b7 = 1
If b3 = 1, Invalid Voltage Error
If b4 = 1, b5 = 1 Invalid Command
Sequence Error
If b5 = 1, Block Unprotect Error
Read Memory Array Command:
– write FFh
AI06158
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