Question

For this problem, you are to design a simple combinational logic circuit

The circuit is a 2- bit priority encoder with inputs I2 and I1 and outputs Z1 and Z0.

The circuit behaves as follows:

      • If I2I1 = 00, then Z1Z0 = 00 (no active input)

     • If I2I1 = 01, then Z1Z0 = 01 (low-priority input, X1, is active)

      • If I2I1 = 1-, then Z1Z0 = 10 (high-priority input, X2, is active)

Note that the value of input I1 does not matter if the high-priority input, I2, is active. Also, output combination Z1Z0 = 11 should never occur.

      a. Give the truth table that shows outputs Z1 and Z0 as functions of inputs I2 and I1.

      b. Give the Boolean algebra expressions for output Z1 and output Z0.

Answer 1