256Mb: 3V Embedded Parallel NOR Flash
Protection Operations
Figure 25: Program/Erase Nonvolatile Protection Bit Algorithm
Start
ENTER Nonvolatile
Protection
COMMAND SET
PROGRAM Nonvolatile
Protection Bit
Addr = BAd
Read byte twice
Addr = BAd
No
DQ6 = Toggle
Yes
No
DQ5 = 1
Yes
Wait 500µs
Read byte twice
Addr = BAd
No
Read byte twice
Addr = BAd
DQ6 = Toggle
Yes
DQ0 =
1 (erase)
0 (program)
No
Yes
Fail
Reset
Pass
EXIT PROTECTION
COMMAND SET
PDF: 09005aef84bd3b68
m29w_256mb.pdf - Rev. B 5/13 EN
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