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 

M29W640DT, M29W640DB

Figure 18. In-System Equipment Group Protect Flowchart

START

n=0

RP = VID

WRITE 60h

ADDRESS = GROUP ADDRESS

A0 = VIL, A1 = VIH, A6 = VIL

WRITE 60h

ADDRESS = GROUP ADDRESS

A0 = VIL, A1 = VIH, A6 = VIL

Wait 100µs

WRITE 40h

ADDRESS = GROUP ADDRESS

A0 = VIL, A1 = VIH, A6 = VIL

Wait 4µs

READ DATA

ADDRESS = GROUP ADDRESS

A0 = VIL, A1 = VIH, A6 = VIL

DATA NO

=

01h

YES

RP = VIH

ISSUE READ/RESET

COMMAND

PASS

++n NO

= 25

YES

RP = VIH

ISSUE READ/RESET

COMMAND

FAIL

Note: 1. Block Protection Groups are shown in APPENDIX D., Table 19. and Table 20..

2. RP can be either at VIH or at VID when using the In-System Technique to protect the Extended Block.

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AI05576

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