W49V002A Datasheet, PDF (11/32 Pages) Winbond – 256K x 8 CMOS FLASH MEMORY WITH LPC INTERFACE

Preliminary W49V002A
Command Codes for Product Identification and Boot Block Lockout Detection
BYTE
SEQUENCE
1 Write
2 Write
3 Write
SOFTWARE PRODUCT IDENTIFICATION /
BOOT BLOCK LOCKOUT DETECTION
ENTRY
ADDRESS
DATA
5555
AA
2AAA
55
5555
90
Pause 10µS
SOFTWARE PRODUCT IDENTIFICATION /
BOOT BLOCK LOCKOUT DETECTION
EXIT (6)
ADDRESS
DATA
5555H
AAH
2AAAH
55H
5555H
F0H
Pause 10µS
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(6)
Load data AA
to
address 5555
Load data 55
to
address 2AAA
(2)
Read address = 00000
data = DA
Load data 55
to
address 2AAA
Load data 90
to
address 5555
(2)
Read address = 00001
data = B0
Load data F0
to
address 5555
Pause 10µ S
(4)
Read address = 00002
DQ0 of data outputs = 1/0
Pause 10µ S
(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: April 2001
Revision A1