Rainbow Electronics W49L102 - Manual (Page 9)

Preliminary W49L102
Publication Release Date: June 1999
- 9 - Revision A1
Command Codes for Product Identification and Boot Block Lockout Detection
BYTE
SEQUENCE
ALTERNATE PRODUCT (6)
IDENTIFICATION/BOOT BLOCK
LOCKOUT DETECTION ENTRY
SOFTWARE PRODUCT
IDENTIFICATION/BOOT BLOCK LOCKOUT
DETECTION EXIT (7)
ADDRESS DATA ADDRESS DATA
1 Write 5555 AA 5555H AAH
2 Write 2AAA 55 2AAAH 55H
3 Write 5555 90 5555H F0H
Pause 20
µ
S Pause 20
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 = 00000
data = DA
Read address = 00001
data = BF
Read address = 00002
data = FF/FE
(4)
Product
Identification Exit(7)
Load data 55
to
address 2AAA
Load data F0
to
address 5555
Normal Mode
(5)
(2)
(2)
Load data AA
to
address 5555
µ
Load data AA
to
address 5555
Pause 10 S
µ
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 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 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.