M29W800DB90N1T View Datasheet(PDF) - Numonyx -> Micron

Part Name

Description

MFG CO.

M29W800DB90N1T

8-Mbit (1 Mbit x 8 or 512 Kbits x 16, boot block) 3 V supply flash memory

Numonyx -> Micron 

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Block protection

M29W800DT, M29W800DB

Figure 21. In-system equipment chip unprotect flowchart

START

PROTECT ALL BLOCKS

n=0

CURRENT BLOCK = 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 BLOCK ADDRESS

A0 = VIL, A1 = VIH, A6 = VIH

Wait 4µs

READ DATA

ADDRESS = CURRENT BLOCK ADDRESS

A0 = VIL, A1 = VIH, A6 = VIH

INCREMENT

CURRENT BLOCK

NO ++n

= 1000

YES

RP = VIH

ISSUE READ/RESET

COMMAND

FAIL

NO DATA YES

=

00h

LAST NO

BLOCK

YES

RP = VIH

ISSUE READ/RESET

COMMAND

PASS

AI03472

50/52

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