CSC347-ENS211 Homework # 5 Solved

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  1. Construct a 5-to-32 line decoder with four 3-to-8 line decoder with enable and a 2-to-4 line decoder. Use block diagrams for the components, label all inputs and outputs.
  2. A combinational circuit is defined by the following three Boolean functions:

F 1 = ( y ′ + x ) z

F 2 = y ′ z ′ + x ′ y + y z ′

F 3 = ( x + y ) z

Design the circuit with a decoder and external gates. Draw the diagram, and label all inputs and outputs. (Hints: turn each function to sum of minterms.)

  1. Design an active high BCD-to-decimal decoder using the unused combinations of the BCD code as don’t-care conditions
  2. Construct a 16×1 multiplexer with two 8×1 and one 2×1 multiplexers. Use block diagrams and label all inputs and outputs.
  3. Implement a full adder with two 4×1 multiplexers. Draw the truth-table, diagram and label the inputs and outputs.
  4. An 8×1 multiplexer has inputs A, B, And C connected to the selection inputs S2, S1, and S0, respectively. The data inputs I0 through I7 are as follows

I1 = I2 = 0, I3 = I7 = 1; I4 = I5 = D’; and I0 = I6 = D;

Determine the Boolean function that the multiplexer implements.

  1.  Using a case statement, write an HDL behavioral description of an eight-bit arithmetic logic unit (ALU). The circuit has a three-bit select bus (Sel), 8-bit input datapaths (A[7:0] and B[7:0]), an eight-bit output datapath (y[7:0]), and performs the arithmetic and logic operations listed below.

Sel  Operation  Description

000   y = 8’b0

001   y = A & B     Bitwise AND

010   y = A | B        Bitwise OR

011   y = A ^ B       Bitwise exclusive OR

100   y = ~ A          Bitwise complement

101   y =  A – B      Subtract

110    y = A + B     Add (Assume A and B are unsigned)

111    y = 8’hFF