MX29F040QC-12 データシートの表示（PDF） - Macronix International

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MX29F040QC-12

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

Macronix International 

MX29F040

CHIP UNPROTECTION ALGORITHM FOR SYSTEM WITHOUT 12V

START

Protect All Sectors

PLSCNT=1

Write "unlock for sector protect/unprotect"

Command (Table 1)

Set OE=A9=VIH

CE=VIL,A6=1

Activate WE Pulse to start

Data do'nt care

No

Toggle bit checking

Q6 not Toggled

Yes

Set OE=CE=VIL

A9=VIH,A1=1

Set Up First Sector Addr

Increment

PLSCNT

Increment

Sector Addr

Read Data from Device

No

Data=00H?

Yes

No

All sectors have

been verified?

Yes

Write Reset Command

Chip Unprotect

Complete

No

PLSCNT=1000?

Yes

Device Failed

* It is recommended before unprotect whole chip, all sectors should be protected in advance.

P/N:PM0538

REV. 2.3, DEC. 10, 2004

31

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