Owner's manual

W49F002U
- 10 -
Command Codes for Product Identification and Boot Block Lockout Detection
BYTE
SEQUENCE
SOFTWARE PRODUCT
IDENTIFICATION/BOOT BLOCK
LOCKOUT DETECTION ENTRY
SOFTWARE PRODUCT
IDENTIFICATION/BOOT BLOCK
LOCKOUT DETECTION EXIT(6)
ADDRESS DATA ADDRESS DATA
1 Write 5555 AA 5555H AAH
2 Write 2AAA 55 2AAAH 55H
3 Write 5555 90 5555H F0H
Pause 10 µS Pause 10 µS
Software Product Identification and Boot Block Lockout Detection Acquisition Flow
Product
Identification
Entry (1)
Load data 55
to
address 2AAA
Load data 90
to
address 5555
Pause 10 S
Product
Identification
and Boot Block
Lockout Detection
Mode (3)
Read address = 0000
data = DA
Read address = 0001
Read address = 0002
data =in DQ0= "1" / "0"
(4)
Product
Identification Exit(6)
Load data 55
to
address 2AAA
Load data F0
to
address 5555
Normal Mode
(5)
(2)
(2)
Load data AA
to
address 5555
µ
µ
Notes for software product identification/boot block lockout detection:
(1) Data Format: DQ7
−
DQ0 (Hex); Address Format: A14
−
A0 (Hex)
(2) A1
−
A17 = V
IL; 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.