W29C102

- 8 -

Command Codes for Product Identification

BYTE

SEQUENCE

ALTERNATE SOFTWARE (5)

PRODUCT IDENTIFICATION

ENTRY

SOFTWARE PRODUCT

IDENTIFICATION ENTRY

SOFTWARE PRODUCT

IDENTIFICATION EXIT

ADDRESS

DATA

ADDRESS

DATA

ADDRESS

DATA

0 Write

5555H

AAH

5555H

AAH

5555H

AAH

1 Write

2AAAH

55H

2AAAH

55H

2AAAH

55H

2 Write

5555H

90H

5555H

80H

5555H

F0H

3 Write

-

-

5555H

AAH

-

-

4 Write

-

-

2AAAH

55H

-

-

5 Write

-

-

5555H

60H

-

-

Pause 10

µS

Pause 10

µS

Pause 10

µS

Software Product Identification Acquisition Flow

Product Identification Entry (1)

Load data AAAA

to

address 5555

Load data 5555

to

address 2AAA

Load data 8080

to

address 5555

Load data AAAA

to

address 5555

Load data 5555

to

address 2AAA

Load data 6060

to

address 5555

Product Identification Mode (2, 3)

Read address = 0

data = 00DA

Read address = 1

data = 004F

Product Identification Exit (1)

Load data AAAA

to

address 5555

Load data 5555

to

address 2AAA

Load data F0F0

to

address 5555

Pause 10 S

Normal Mode

(4)

Pause 10 S

µ

µ

Notes for software product identification:

(1) Data format: DQ15

−DQ0 (Hex); address format: A14−A0 (Hex).

(2) A1

(3) The device does not remain in identification mode if power down.

(4) The device returns to standard operation mode.

(5) This product supports both the JEDEC standard 3 byte command code sequence and original 6 byte

command code sequence. For new designs, Winbond recommends that the 3 byte command code sequence be used.