W49F002U Datasheet, PDF (10/23 Pages) Winbond – 256K X 8 CMOS FLASH MEMORY

W49F002U
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 10 µS
SOFTWARE PRODUCT
IDENTIFICATION/BOOT BLOCK
LOCKOUT DETECTION EXIT(6)
ADDRESS
DATA
5555H
AAH
2AAAH
55H
5555H
F0H
Pause 10 µS
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 55
to
address 2AAA
(2)
Read address = 0000
data = DA
Load data 55
to
address 2AAA
Load data 90
to
address 5555
(2)
Read address = 0001
Load data F0
to
address 5555
(4)
Pause 10 µS
Read address = 0002
µ
data =in DQ0= "1" / "0"
(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 output data in DQ0= " 1 " the boot block programming lockout feature is activated; if the output data in DQ0 = " 0 ,"
the lockout feature is inactivated and the boot block can be programmed.
(5) The device returns to standard operation mode.
(6) Optional 1-byte cycle (write F0 hex at XXXX address) can be used to exit the product identification/boot block lockout
detection.
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