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Unformatted text preview: ECE 152A Fall 2006 12/7/2006 Homework #7 Solution Page 1 of 18 University of California, Santa Barbara Department of Electrical and Computer Engineering ECE 152A Digital Design Principles Homework #7 Solution Problem #1. For the function below: F (A,B,C) = m (1,2,4,5,7) (1) Express the function in standard (minimized) sum of products form (2) Construct a truth table for the function ECE 152A Fall 2006 12/7/2006 Homework #7 Solution Page 2 of 18 (3) Implement the function with a fourtoone multiplexer: (4) Using Shannons expansion theorem, expand the function from part (1) above in terms of the variable A. Show all steps. (5) Implement the function with a twotoone MUX and the minimum number of additional gates. ECE 152A Fall 2006 12/7/2006 Homework #7 Solution Page 3 of 18 Problem #2. In this problem you are to design a 4bit barrel shifter (using TTL components) and determine its maximum frequency (minimum clock period) of operation. Note: This problem consists of 4 parts. It is possible to do parts 3 and 4 without doing parts 1 and 2. A barrel shifter allows rotating the contents of a register an arbitrary number of bits to the left or right. If the bits in this register are labeled A, B, C and D the operation of the barrel shifter is as shown below: Shift Direction Count Register Contents Right 0 A B C D Right 1 D A B C Right 2 C D A B Right 3 B C D A Left 0 A B C D Left 1 B C D A Left 2 C D A B Left 3 D A B C The barrel shifter can be constructed using four D flipflops and four 4:1 multiplexers, one on the D input of each flipflop. multiplexers, one on the D input of each flipflop....
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This note was uploaded on 04/30/2008 for the course ECE 152a taught by Professor Johnson during the Summer '07 term at UCSB.
 Summer '07
 Johnson

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