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Unformatted text preview: Homework #7 February 17, 2010 1 Homework #7 due March 1 at noon ECE 15a Winter 2010 1. (15p) Design a combinational circuit with three inputs, x,y, and z, and three outputs: A, B, and C. When the binary input is 0,1,2, or 3, the binary output is one greater than the input. When the binary input is 4, 5, 6 or 7, the binary output is one less than the output. Truth table: xyz ABC 000 001 001 010 010 011 011 100 100 011 101 100 110 101 111 110 Kmap: A: B: C: A=yz+xz+xy B=y’z+xz+x’yz’ C=z’ 1 1 1 1 1 10 11 01 yz x 1 1 1 1 1 10 11 01 yz x 1 1 1 1 1 10 11 01 yz x 2. (10p) A majority circuit is a combinational circuit whose output is equal to 1 if the input variables have more 1’s than 0’s. The output is 0 otherwise. Design a 5input majority circuit. At least 3 inputs should be 1 if output is 1. So we have Y=abc+abd+abe+acd+ace+ade+bcd+bce+bde+cde y z x z x y A y’ z x z x’ y B z’ z’ C 3. (10p) Design a 4bit combinational circuit 2’s complementer. (The output generates the 2’s complement 3....
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 Spring '08
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 ASCII, 4bit, Combinational Circuit, 000 001 001 010 010 011 011 100 100 011 101 100 110 101 111 110 K

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