Preliminary W49V002A

Publication Release Date: April 2001

- 11 -

Revision A1

Command Codes for Product Identification and Boot Block Lockout Detection

BYTE

SEQUENCE

SOFTWARE PRODUCT IDENTIFICATION /

BOOT BLOCK LOCKOUT DETECTION

ENTRY

SOFTWARE PRODUCT IDENTIFICATION /

BOOT BLOCK LOCKOUT DETECTION

EXIT (6)

ADDRESS

DATA

ADDRESS

DATA

1 Write

5555

AA

5555H

AAH

2 Write

2AAA

55

2AAAH

55H

3 Write

5555

90

5555H

F0H

Pause 10

µS

Pause 10

µS

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 = B0

Read address = 00002

DQ0 of data outputs = 1/0

(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) If the DQ0 of output data is "1," the boot block programming lockout feature is activated; if the DQ0 of output data "0," the lockout feature

is inactivated and the block can be programmed.

(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.