W49V002FA Просмотр технического описания (PDF) - Winbond

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W49V002FA

256K X 8 CMOS FLASH MEMORY WITH FWH INTERFACE

Winbond 

W49V002FA

Software Product Identification and Boot Block Lockout Detection Acquisition

Flow

Product

Identification

Entry (1)

Load data AA

to

address 5555

Load data 55

to

address 2AAA

Load data 90

to

address 5555

Pause 10 µS

Product

Identification

and Boot Block

Lockout Detection

Mode (3)

Product

Identification Exit(6)

Load data AA

to

address 5555

(2)

Read address = 00000

data = DA

Load data 55

to

address 2AAA

(2)

Read address = 00001

data = 32 (Hex)

Load data F0

to

address 5555

(4)

Read address = 00002

DQ0 of data outputs = 1/0

Pause 10 µS

(5)

Normal Mode

Notes for software product identification/boot block lockout detection:

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

(2) A1 − A17 = 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 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.

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Publication Release Date: February 19, 2002

Revision A2

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