W39L020 Datasheet, PDF (13/26 Pages) Winbond – 256K × 8 CMOS FLASH MEMORY

Boot Block Lockout Enable Flow Chart
W39L020
Boot Block Lockout
Feature Set Flow
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 80
to
address 5555
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 40/70 _{40 to lock 64K Boot Block}
to
70 to lcok 16K Boot Block
address 5555
Load data XX
to
address 3FFFF/0
3FFFF(XX) to lock Top Boot Block
000000(XX) to lock Bottom Boot Block
Pause 2mS
Exit
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Publication Release Date: November 11, 2002
Revision A4