- The combinational circuit ARITHMETIC/LOGIC (A/L) performs the following operations depending on the value of the control inputs X, Y, and Z.
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The meanings of symbols are given below:
| Symbol | Meaning |
| + | Arithmetic addition |
| – | Arithmetic subtraction |
| 4-bit logic AND between corresponding bits of A and B: A3B3, …, A0B0. | |
| 4-bit logic XOR between corresponding bits of A and B: A3 B3, …, A0 B0. | |
| Φ | Don’t care |
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Design and draw this circuit using only the standard components and logic gates given below, paying attention to the maximum number allowed for the first three:
| Type | Maximum number allowed |
| 4-bit parallel adders | 2 |
| 8:1 multiplexer | 1 |
| 2:4 decoder | 1 |
| XOR gates | No restriction |
| NOT gates | No restriction |
| OR gates | No restriction |
| AND gates | No restriction |
