Question

PAL devices composed of

• A. Fixed array of AND gates followed by a fixed array of OR gates
• B. Programmable AND and OR gate arrays
• C. Fixed array of AND gates followed by a programmable array of OR gates
• D. Programmable array of AND gates followed by a fixed array of OR gates

Hint:

Remember: PAL: \[ \text{Programmable AND + Fixed OR} \] PLA: \[ \text{Programmable AND + Programmable OR} \]

Answer 1

The Correct Option is D

Concept: PAL stands for \[ \text{Programmable Array Logic}. \] It contains a programmable AND array and a fixed OR array.

Step 1: Recall PAL architecture.
Input variables first enter a programmable AND plane.

Step 2: Observe output formation.
The resulting product terms are combined through fixed OR gates.

Step 3: Conclusion.
\[ \boxed{\text{Programmable AND array + Fixed OR array}} \] Hence option (D) is correct.