W29F102
Command Codes for Product Identification and Boot Block Lockout Detection
BYTE
SEQUENCE
PRODUCTIDENTIFICATION/BOOT
BLOCK LOCKOUT DETECTION
ENTRY
SOFTWARE PRODUCT
IDENTIFICATION/BOOT BLOCK LOCKOUT
DETECTION EXIT (6)
ADDRESS
5555
DATA
AA
ADDRESS
5555H
DATA
AAH
55H
1 Write
2 Write
3 Write
2AAA
55
2AAAH
5555H
5555
90
F0H
Pause 10 mS
Pause 10 mS
Software Product Identification and Boot Block Lockout Detection Acquisition Flow
Product
Product
Identification
Entry (1)
Product
Identification Exit(6)
Identification
and Boot Block
Lockout Detection
Mode (3)
Load data AA
to
address 5555
Load data AA
to
address 5555
(2)
Load data 55
to
address 2AAA
Load data 55
to
address 2AAA
Read address = 0000
data = DA
(2)
(4)
Load data 90
Load data F0
to
Read address = 0001
data = 2F
to
address 5555
address 5555
Read address = 0002
data = FF/FE
Pause 10 S
m
Pause 10mS
(5)
Normal Mode
Notes for software product identification/boot block lockout detection:
(1) Data Format: DQ15-DQ8 (Don't Care), DQ7- DQ0 (Hex); Address Format: A14- A0 (Hex)
(2) A1- A15 = 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 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.
(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.
Publication Release Date: June 1999
- 9 -
Revision A4
WINBOND [ WINBOND ]
