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Design a PROM which will convert BCD numbers into Gray code
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PROM stands for Programmable Read Only Memory. It consists of fixed AND array (decoder) and programmable OR array.

The truth table fro BCD to Gray code conversion

A B C D W X Y Z
0 0 0 0 0 0 0 0
0 0 0 1 0 0 0 1
0 0 1 0 0 0 1 1
0 0 1 1 0 0 1 0
0 1 0 0 0 1 1 0
0 1 0 1 1 1 1 0
0 1 1 0 1 0 1 0
0 1 1 1 1 0 1 1
1 0 0 0 1 0 0 1
1 0 0 1 1 0 0 0
1 0 1 0 x x x x
1 0 1 1 x x x x
1 1 0 0 x x x x
1 1 0 1 x x x x
1 1 1 0 x x x x
1 1 1 1 x x x x

 Here [A,B,C,D] are inputs and the data outputs are [W,X,Y,Z].

The BCD values are from 0000 to 1001. So we have taken the Gray code values till 1001.

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