W49V002FA Datasheet, PDF (11/32 Pages) Winbond – 256K X 8 CMOS FLASH MEMORY WITH FWH INTERFACE

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.
- 11 -
Publication Release Date: February 19, 2002
Revision A2