W39V040A Datasheet, PDF (12/34 Pages) Winbond – 512K × 8 CMOS FLASH MEMORY WITH LPC INTERFACE

W39V040A
Software Product Identification and Boot Block Lockout Detection Acquisition Flow
Product
Identification
Entry (1)
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 90
to
address 5555
Pause 10 µS
Product
Identification
and Boot Block
Lockout Detection
Mode (3)
Product
Identification Exit (6)
Load data AA
to
address 5555
(2)
Read address = 00000
data = DA
Load data 55
to
address 2AAA
(2)
Read address = 00001
data = 3D
Load data F0
to
address 5555
Read address = 00002 (4)
DQ0/DQ1 of data outputs
= 1/0
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[3:0] to indicate the sectors protect status as below:
DQ0
0
64Kbytes Boot Block
Unlocked by Software
1
64Kbytes Boot Block
Locked by Software
DQ1
16Kbytes Boot Block
Unlocked by Software
16Kbytes Boot Block
Locked by Software
DQ2
64Kbytes Boot Block Unlocked
by #TBL hardware trapping
64Kbytes Boot Block Locked by
#TBL hardware trapping
DQ3
Whole Chip Unlocked by #WP hardware
trapping Except Boot Block
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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