W29C040-90 データシートの表示（PDF） - Winbond

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W29C040-90

512K ·8 CMOS FLASH MEMORY

Winbond 

W29C040

Command Codes for Product Identification and Boot Block Lockout Detection

BYTE SEQUENCE

0 Write

1 Write

2 Write

3 Write

4 Write

5 Write

ALTERNATE PRODUCT (7)

IDENTIFICATION/BOOT BLOCK LOCKOUT

DETECTION ENTRY

ADDRESS

DATA

5555

AA

2AAA

55

5555

90

-

-

-

-

-

-

Pause 10 µS

SOFTWARE PRODUCT

IDENTIFICATION/BOOT BLOCK LOCKOUT

DETECTION EXIT

ADDRESS

DATA

5555H

AAH

2AAAH

55H

5555H

F0H

-

-

-

-

-

-

Pause 10 µS

Software Product Identification and Boot Block Lockout Detection Acquisition Flow

Product

Identification

Entry (1)

Load data AA

to

address 5555

Product

Identification

and Boot Block

Lockout Detection

Mode (3)

Product

Identification

Exit (1)

Load data 55

to

address 2AAA

(2)

Read address = 00000

data = DA

Load data AA

to

address 5555

Load data 90

to

address 5555

(2)

Read address = 00001

data = 46

Load data 55

to

address 2AAA

(4)

Read address = 00002

data = FF/FE

Load data F0

to

address 5555

(5)

Read address = 7FFF2

data = FF/FE

Pause 10 uS

(6)

Normal Mode

Notes for software product identification/boot block lockout detection:

(1) Data Format: DQ7 − DQ0 (Hex); Address Format: A14 − A0 (Hex)

(2) A1 − A18 = VIL; manufacture code is read for A0 = VIL; device code is read for A0 = VIH.

(3) The device does not remain in identification and boot block (address 0002 Hex/7FFF2 Hex respond to first 16K/last 16K) lockout detection mode

if power down.

(4), (5) If the output data is "FF Hex," the boot block programming lockout feature is activated; if the output data "FE Hex," the lockout feature is

inactivated and the block can be programmed.

(6) The device returns to standard operation mode.

(7) This product supports both the JEDEC standard 3 bytes command code sequence and original 6 byte command code sequence. For new

designs, Winbond recommends that the 3 bytes command code sequence be used.

-8-

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