M29W640DB90N6T(2004) 查看數據表（PDF） - STMicroelectronics

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M29W640DB90N6T
(Rev.:2004)

64 Mbit (8Mb x8 or 4Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

Figure 19. In-System Equipment Chip Unprotect Flowchart

M29W640DT, M29W640DB

START

PROTECT ALL GROUPS

n=0

CURRENT GROUP = 0

RP = VID

WRITE 60h

ANY ADDRESS WITH

A0 = VIL, A1 = VIH, A6 = VIH

WRITE 60h

ANY ADDRESS WITH

A0 = VIL, A1 = VIH, A6 = VIH

Wait 10ms

WRITE 40h

ADDRESS = CURRENT GROUP ADDRESS

A0 = VIL, A1 = VIH, A6 = VIH

Wait 4µs

READ DATA

ADDRESS = CURRENT GROUP ADDRESS

A0 = VIL, A1 = VIH, A6 = VIH

INCREMENT

CURRENT GROUP

NO ++n

= 1000

YES

RP = VIH

ISSUE READ/RESET

COMMAND

FAIL

NO DATA

=

00h

YES

LAST NO

GROUP

YES

RP = VIH

ISSUE READ/RESET

COMMAND

PASS

AI05577

Note: Block Protection Groups are shown in APPENDIX D., Table 19. and Table 20..

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