Priority Encoder

  1. Design 4 to 2 priority encoder with valid signal

2. Design 16 to 4 priority encoder using the 4 to 2 PE you have just built.

Hint

For question 2, Use five 4 to 2 PE and two OR gates.

1. Answer

  1. Starting with the truth table:

Notice: x is “don’t care”

From the truth table we can define Y0 , Y1 and Valid.

Y0 = X1X2‘ + X3

Y1 = X3 +X2

V = X0 + X1 + X2 + X3

2. Answer

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