Rainbow Electronics W49F002U - Manual (Page 10)

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
µ
S Pause 10
µ
S
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 = V IL ; device code is read for A0 = V IH .
(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.