w49f102 Winbond Electronics Corp America, w49f102 Datasheet - Page 9

• Manufacturer Part Number: w49f102
• Description: 64k X 16 Cmos Flash Memory
• Manufacturer: Winbond Electronics Corp America

Command Codes for Product Identification and Boot Block Lockout Detection
Software Product Identification and Boot Block Lockout Detection Acquisition Flow
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 = V
(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
(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.
SEQUENCE
inactivated and the block can be programmed.
1 Write
2 Write
3 Write
BYTE
IL
; manufacture code is read for A0 = V
Entry (1)
Identification
Product
address 5555
address 5555
address 2AAA
Pause 10 S
Load data AA
Load data 55
Load data 90
BLOCK LOCKOUT DETECTION ENTRY
PRODUCT IDENTIFICATION/BOOT
to
to
to
ADDRESS
2AAA
5555
5555
Pause 10 S
Identification
and Boot Block
Lockout Detection
Mode (3)
Product
Read address = 00002
Read address = 00000
Read address = 00001
IL
; device code is read for A0 = V
data = FF/FE
data = DA
data = 2F
DATA
AA
55
90
- 9 -
(4)
(2)
(2)
IDENTIFICATION/BOOT BLOCK LOCKOUT
IH
.
ADDRESS
Product
Identification Exit (6)
Publication Release Date: October 2000
2AAAH
5555H
5555H
SOFTWARE PRODUCT
DETECTION EXIT (6)
Normal Mode
address 5555
Load data 55
address 2AAA
Load data AA
address 5555
Load data F0
Pause 10 S
Pause 10 S
to
to
to
W49F102
(5)
DATA
AAH
55H
F0H
Revision A3