Rainbow Electronics W49F020 - Manual (Page 5)

Preliminary W49F020
Publication Release Date: October 1999
- 5 - Revision A1
TABLE OF OPERATING MODES
Operating Mode Selection
(V HH = 12V
±
5
%
)
MODE PINS
CE OE WE ADDRESS DQ.
Read V IL V IL V IH A IN Dout
Write V IL V IH V IL A IN Din
Standby V IH X X X High Z
Write Inhibit X V IL X X High Z/D OUT
X X V IH X High Z/D OUT
Output Disable X V IH X X High Z
Product ID V IL V IL V IH A0 = V IL ; A1
−
A17 = V IL ;
A9 = V HH
Manufacturer Code DA (Hex)
V IL V IL V IH A0 = V IL ; A1
−
A17 = V IL ;
A9 = V HH
Device Code 8C (Hex)
TABLE OF COMMAND DEFINITION
COMMAND NO. OF 1ST CYCLE 2ND CYCLE 3RD CYCLE 4TH CYCLE 5TH CYCLE 6TH CYCLE
DESCRIPTION Cycles Addr. Data Addr. Data Addr. Data Addr. Data Addr. Data Addr. Data
Read 1 A
IN
D
OUT
Chip Erase 6 5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 10
Byte Program 4 5555 AA 2AAA 55 5555 A0 A
IN
D
IN
Boot Block Lockout 6 5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 40
Product ID Entry 3 5555 AA 2AAA 55 5555 90
Product ID Exit
(1)
3 5555 AA 2AAA 55 5555 F0
Product ID Exit
(1)
1 XXXX F0
Notes:
1. Address Format: A14 − A0 (Hex); Data Format: DQ7-DQ0 (Hex)
2. Either one of the two Product ID Exit commands can be used.