The document outlines various code conversion methods, focusing on grey code and excess-3 code. It details the binary to grey code and grey to binary conversions, as well as BCD to excess-3 code conversions using IC 7483. Key features of grey code include reduced switching operations and dynamic power consumption.

1. 1
CSL 202, Code Converters
MEC

2. 2
Contents
• Features of Grey Code.
• Binary to Grey Code Conversion.
• Grey Code to Binary Conversion.
• Features of Excess 3 Code.
• BCD to Excess 3 Code Conversion.
• Code Conversion using IC 7483.

3. 3
Grey Code
Unit Distance Code
Reduces Switching Operations.
Reduces Dynamic Power Consumption.

4. 4

5. 5
Binary to Grey Code Conversion
Grey Code:
Only one bit change
between adjacent
numbers.
Binary Input

6. 6
Binary to Grey Code Conversion

7. 7

8. 8
Grey Code to Binary Conversion
Grey Code Input Binary Output

9. 9
Grey Code to Binary Conversion
Truth Table

10. 10
Binary to Grey/Grey to Binary Code
Conversion with Mode Control
M = 0 – Binary to Grey Conversion
M = 1 – Grey to Binary Conversion

11. 11
Binary/Excess 3 Code Converter
with Mode Control
Truth Tables

12. 12

13. 13
Excess 3 Code
• Non-weighted and self-complementary
BCD code used to represent the decimal
numbers.
• Uses different algorithm than normal non-
biased BCD or binary positional number
system.
• Codes 1111 and 0000 are never used for
any decimal digit.
• Add 3 to the decimal digit.

14. 14
BCD to Excess 3 Code Conversion

15. 15
BCD to Excess 3 Code Conversion
XS’3 Code = BCD Number + 3.

16. 16
BCD/Excess 3 Code Conversion
using IC 7483

17. 17
Thank You