W29C020 Datasheet, PDF (17/21 Pages) Winbond – 256K X 8 CMOS FLASH MEMORY

W29C020
Timing Waveforms, continued
Reset Software Data Protection Timing Diagram
Address A15-0
DQ7-0
CE
OE
WE
Six-byte sequence for resetting
software data protection mode
TWC
5555
2AAA
5555
5555
2AAA
5555
AA
55
80
AA
55
20
TWP
TBLC
TWPH
SW0
SW1
SW2
SW3
SW4
SW5
Internal programming starts
Software Chip Erase Timing Diagram
Address A15-0
DQ7-0
CE
OE
WE
Six-byte code for 5V-only software
chip erase
TWC
5555
2AAA
5555
5555
2AAA 5555
AA
55
80
AA
55
10
TWP
TBLC
TWPH
SW0
SW1
SW2
SW3
SW4
SW5
Internal erasing starts
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Publication Release Date: February 1998
Revision A3