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Another variation on the majority function assigns veto power to certain members. Independent of how the others have voted, a member with veto power can defeat the motion. Show the truth table for this 3-input majority function with only one member having veto power. Derive a simplified logical expression and show the corresponding implementation.

 

We want to build a logic circuit to generate the even-parity bit for 7-bit ASCII characters. In transmitting an ASCII character, we transmit 7 ASCII bits and a parity bit to facilitate rudimentary error detection. Design such a circuit using 2-input XOR gates. What modification would we make to this circuit if we wanted to generate odd parity?