S-2940I (4B - Epson LQ-510 Technical Manual

APPENDIX
A.1.1.6 S-2940I (4B)
The S-2940I is a 16 x 8-bit EEPROM. The pin diagram is given in Figure A-12, and the block diagram in
Figure A-13; Table A-8 lists and describes the commands.
S K
A-12
cs
SK
DO
Figure A-12. S-2940I Pin Diagram
vcc
GND
MEMORY
ARRAY
1 6 x 8
GENERATOR
Figure A-13. S-2940I Block Diagram
Table A-8. S-2940I Commands
Opcode
Address
AAAA
1001
AAAA
0110
0000
0000
0000
1111
0000
1100
0000
0011
S 2 9 4 0
NC
NC
GND
ADDRESS
DECODER
Command Set
Data
I
D0-D7
D0-D7
-
-
-
-
OUTPUT
- D 0
BUFFER
Function
READ ADDRESS
PROGRAM ADDRESS
PROGRAM ENABLE
PROGRAM DISABLE
ERASE ALL ADDRESS
PROGRAM ALL ADDRESS
REV.-A
LQ-510