W29C020CP90B Winbond Electronics, W29C020CP90B Datasheet - Page 9

• Manufacturer Part Number: W29C020CP90B
• Description: IC FLASH 2MBIT 90NS 32PLCC
• Manufacturer: Winbond Electronics

Specifications of W29C020CP90B

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 2M (256K x 8)
• Speed: 90ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Q1321111

Command Codes for Boot Block Lockout Enable
Boot Block Lockout Enable Acquisition Flow
Notes for boot block lockout enable:
1. Data Format: DQ7
2. Address Format: A14
3. If you have any questions about this commend sequence, please contact the local distributor or Winbond Electronics Corp.
BYTE SEQUENCE
0 Write
1 Write
2 Write
3 Write
4 Write
5 Write
6 Write
DQ0 (Hex)
A0 (Hex)
BOOT BLOCK LOCKOUT FEATURE SET
ON FIRST 8K ADDRESS BOOT BLOCK
ADDRESS
Boot Block Lockout
Feature Set on First 8K
Address Boot Block
address 2AAA
Load data AA
address 5555
address 5555
address 2AAA
Load data 55
Load data 80
Load data AA
address 5555
address 5555
Load data 55
Load data 40
Pause 10 mS
address 00000
00000H
Load data 00
2AAAH
2AAAH
5555H
5555H
5555H
5555H
to
to
to
to
to
to
to
Pause 10 S
- 9 -
DATA
Boot Block Lockout
Feature Set on Last 8K
Address Boot Block
AAH
AAH
address 3FFFF
55H
80H
55H
40H
00H
address 2AAA
Load data AA
address 5555
address 2AAA
address 5555
address 5555
Load data AA
address 5555
Load data 40
Load data FF
Load data 80
Load data 55
Pause 10 mS
Load data 55
to
to
to
to
to
to
to
Publication Release Date: February 18, 2002
BOOT BLOCK LOCKOUT FEATURE SET
ON LAST 8K ADDRESS BOOT BLOCK
ADDRESS
3FFFFH
2AAAH
2AAAH
5555H
5555H
5555H
5555H
Pause 10 S
W29C020C
DATA
AAH
AAH
FFH
55H
80H
55H
40H
Revision A4