W39V040FA

Publication Release Date: December 19, 2002

- 13 -

Revision A2

Software Product Identification and Boot Block Lockout Detection Acquisition

Flow

Product

Identification

Entry (1)

Load data 55

to

address 2AAA

Load data 90

to

address 5555

Pause 10 S

Product

Identification

and Boot Block

Lockout Detection

Mode (3)

Read address = 00000

data = DA

Read address = 00001

data = 34

Read address = 7FFF2

Check DQ[3:0] of data

outputs

(4)

Product

Identification Exit(6)

Load data 55

to

address 2AAA

Load data F0

to

address 5555

Normal Mode

(5)

(2)

(2)

Load data AA

to

address 5555

µ

Load data AA

to

address 5555

Pause 10 S

µ

Notes for software product identification/boot block lockout detection:

(1) Data Format: DQ7

− DQ0 (Hex); Address Format: A14 − A0 (Hex)

(2) A1

(3) The device does not remain in identification and boot block lockout detection mode if power down.

(4) The DQ[3:0] to indicate the sectors protect status as below:

DQ0

DQ1

DQ2

DQ3

0

64K Boot Block

Unlocked by Software

16Kbytes Boot Block

Unlocked by Software

64Kbytes Boot Block

Unlocked by #TBL

hardware trapping

Whole Chip Unlocked by #WP

hardware trapping Except Boot

Block

1

64K Boot Block

Locked by Software

16Kbytes Boot Block

Locked by Software

64Kbytes Boot Block

Locked by #TBL hardware

trapping

Whole Chip Locked by #WP

hardware trapping Except Boot

Block

(5) The device returns to standard operation mode.

(6) Optional 1-write cycle (write F0 (hex.) at XXXX address) can be used to exit the product identification/boot block lockout

detection.