29F4000 View Datasheet(PDF) - Macronix International

Part Name

Description

Manufacturer

29F4000

4M-BIT [512KX8] CMOS EQUAL SECTOR FLASH MEMORY

Macronix International 

MX29F4000

SECTOR PROTECTION ALGORITHM FOR SYSTEM WITHOUT 12V

START

PLSCNT=1

Write "unlock for sector protect/unprotect"

Command(Table1)

Set Up Sector Addr

(A18, A17, A16)

OE=VIH,A9=VIH

CE=VIL,A6=VIL

Activate WE Pulse to start

Data don't care

Increment PLSCNT

No

Toggle bit checking

No

Q6 not Toggled

.

Yes

Set CE=OE=VIL

A9=VIH

Read from Sector

Addr=SA, A1=1

No

PLSCNT=32?

Yes

Device Failed

Data=01H?

Protect Another

Yes

Sector?

Write Reset Command

Sector Protection

Complete

P/N:PM0629

REV. 1.0, DEC. 20, 1999

30

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