M29W040-200N6R View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M29W040-200N6R

4 Mbit (512Kb x8, Uniform Block) Low Voltage Single Supply Flash Memory

STMicroelectronics 

Figure 14. Block Unprotecting Flowchart

M29W040

START

PROTECT

ALL BLOCKS

n=0

A6, A12, A16 = VIH

E, G, A9 = VIH

Wait 4µs

E, G, A9 = VID

Wait 4µs

W = VIL

Wait 10ms

W = VIH

E, G = VIH

Wait 4µs

READ at UNPROTECTION

ADDRESS: A1, A6 = VIH, A0 = VIL and

A16, A17, A18 DEFINING BLOCK

(see Note 1)

NO ++n

= 1000

YES

FAIL

NO DATA YES

=

00h

INCREMENT

BLOCK

LAST NO

SECT.

YES

PASS

AI01371E

Note: 1. A6 is kept at VIH during unprotection algorithm in order to secure best unprotection verification. During all other protection status

reads, A6 must be kept at VIL.

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