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 17. Programmer Equipment Chip Unprotect Flowchart

M29W640DT, M29W640DB

START

PROTECT ALL GROUPS

n=0

CURRENT GROUP = 0

A6, A12, A15 = VIH(1)

E, G, A9 = VID

Wait 4µs

W = VIL

Wait 10ms

W = VIH

E, G = VIH

ADDRESS = CURRENT GROUP ADDRESS

A0 = VIL, A1, A6 = VIH

E = VIL

Wait 4µs

G = VIL

Wait 60ns

Read DATA

INCREMENT

CURRENT GROUP

NO ++n

= 1000

YES

A9 = VIH

E, G = VIH

FAIL

NO DATA YES

=

00h

LAST NO

GROUP

YES

A9 = VIH

E, G = VIH

PASS

AI05575

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

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