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W29C020S-70B Fiches technique(PDF) 8 Page - Winbond

No de pièce W29C020S-70B
Description  256K X 8 CMOS FLASH MEMORY
Download  21 Pages
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Fabricant  WINBOND [Winbond]
Site Internet  http://www.winbond.com
Logo WINBOND - Winbond

W29C020S-70B Fiches technique(HTML) 8 Page - Winbond

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W29C020
- 8 -
Command Codes for Product Identification and Boot Block Lockout Detection
BYTE
SEQUENCE
ALTERNATE PRODUCT (7)
IDENTIFICATION/BOOT BLOCK
LOCKOUT DETECTION ENTRY
SOFTWARE PRODUCT
IDENTIFICATION/BOOT BLOCK
LOCKOUT DETECTION ENTRY
SOFTWARE PRODUCT
IDENTIFICATION/BOOT BLOCK
LOCKOUT DETECTION EXIT
ADDRESS
DATA
ADDRESS
DATA
ADDRESS
DATA
0 Write
5555
AA
5555H
AAH
5555H
AAH
1 Write
2AAA
55
2AAAH
55H
2AAAH
55H
2 Write
5555
90
5555H
80H
5555H
F0H
3 Write
-
-
5555H
AAH
-
-
4 Write
-
-
2AAAH
55H
-
-
5 Write
-
-
5555H
60H
-
-
Pause 10
µS
Pause 10
µS
Pause 10
µS
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 80
to
address 5555
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data 60
to
address 5555
Product
Identification
and Boot Block
Lockout Detection
Mode (3)
Read address = 00000
data = DA
Read address = 00001
data = 45
Read address = 00002
data = FF/FE
(4)
Read address = 3FFF2
data = FF/FE
(5)
Product
Identification
Exit (1)
Load data AA
to
address 5555
Load data 55
to
address 2AAA
Load data F0
to
address 5555
Pause 10 S
Normal Mode
(6)
(2)
(2)
Pause 10 S
µ
µ
Notes for software product identification/boot block lockout detection:
(1) Data Format: DQ7
−DQ0 (Hex); Address Format: A14−A0 (Hex)
(2) A1
−A16 = 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 (address 0002 Hex/3FFF2 Hex respond to first 8K/last 8K) lockout detection mode if
power down.
(4), (5) 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.
(6) The device returns to standard operation mode.
(7) This product supports both the JEDEC standard 3 byte command code sequence and original 6 byte command code sequence. For new
designs, Winbond recommends that the 3 byte command code sequence be used.


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