W29C020CP90B Winbond Electronics, W29C020CP90B Datasheet - Page 6

• 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 Software Data Protection
Software Data Protection Acquisition Flow
Notes for software program code:
Data Format: DQ7
Address Format: A14
BYTE SEQUENCE
0 Write
1 Write
2 Write
3 Write
4 Write
5 Write
(Optional page-load
DQ0 (Hex)
A0 (Hex)
operation)
TO ENABLE PROTECTION
ADDRESS
2AAAH
5555H
5555H
-
-
-
Software Data Protection
Enable Flow
Sequentially load
up to 128 bytes
address 2AAA
Pause 10 mS
address 5555
Load data AA
address 5555
of page data
Load data 55
Load data A0
Exit
to
to
to
DATA
- 6 -
AAH
A0H
55H
-
-
-
Software Data Protection
Disable Flow
ADDRESS
2AAAH
2AAAH
TO DISABLE PROTECTION
address 2AAA
address 2AAA
5555H
5555H
5555H
5555H
address 5555
Load data AA
address 5555
address 5555
Pause 10 mS
address 5555
Load data AA
Load data 20
Load data 55
Load data 55
Load data 80
Exit
to
to
to
to
to
to
W29C020C
DATA
AAH
AAH
55H
80H
55H
20H