The parallel bus arbitration technique uses an external priority encoder and a decoder. Suppose, a parallel arbiter has 5 bus arbiters. What will be the size of the priority encoder and decoder respectively?

1. A4 × 2, 2 × 4
2. B2 × 4, 4 × 2
3. C3 × 8, 8 × 3
4. D8 × 3, 3 × 8

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Correct answer: D. 8 × 3, 3 × 8

Explanation

5 arbiters need 3 bits, so an 8 × 3 priority encoder and a 3 × 8 decoder.