W39V040FC Datasheet, PDF (19/36 Pages) Winbond – 512K × 8 CMOS FLASH MEMORY WITH FWH INTERFACE

W39V040FC
13. 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 AA
to
address 5555
Load data 55
to
address 2AAA
(2)
Read address = 00000
data = DA
Load data 55
to
address 2AAA
Load data 90
to
address 5555
(2)
Read address = 00001
data = 50
Load data F0
to
address 5555
Pause 10 μS
Read address = 7FFF2 ⁽⁴⁾
Check DQ[3:0] of data
outputs
Pause 10 μS
(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−A18 = 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) The DQ[3:2] to indicate the sector s protect status as below:
DQ2
DQ3
0 64Kbytes Boot Block Unlocked by #TBL
hardware trapping
Whole Chip Unlocked by #WP hardware trapping Except
Boot Block
1 64Kbytes Boot Block Locked by #TBL
hardware trapping
Whole Chip Locked by #WP hardware trapping Except
Boot Block
(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.
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Publication Release Date: Apr. 11, 2006
Revision A1