# HW8 - Ryan Zanski ECE 2504 Introduction to Computer...

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Ryan Zanski ECE 2504 Introduction to Computer Engineering, Summer I 2010 Homework 8 Due date: 16 Jun10, 11:55pm Show all work. Use Logicworks to draw circuit diagrams. 1. (5 pts) Construct a 8x1 multiplexer using only 2x1 multiplexers. 2. (6 pts) The content of a 4-bit register is initially 1101. The register is shifted twice to the left, followed by 4 times to the right while the serial input is 010010. What is the content of the register after each shift? Start: 1101 Left: 1010 Left: 0101 Right: 0010 Right: 0001 Right: 1000 Right: 0100 3. (6 pts) Consider 4-bit counters with parallel load capability. 1

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Ryan Zanski Draw a block diagram showing how they should be connected to produce a 12-bit counter with parallel load capability. 2
Ryan Zanski 4. (5 pts) A mux can be utilized to implement arbitrary logic functions. Consider the sum of minterms expression f(A,B,C,D)= (1,4,6,9,12,13,14). How should an 8x1 mux be connected to Σ implement this function? 0 0 0 0 0 D 0 0 0 1 1 D 0 0 1 0 0 0 0 0 1 1 0 0 0 1 0 0 1 D' 0 1 0 1 0 D' 0 1 1 0 1 D' 0 1 1 1 0 D' 1 0 0 0 0 D 1 0 0 1 1 D 1 0 1 0 0 0 1 0 1 1 0 0 1 1 0 0 1 1 1 1 0 1 1 1 1 1 1 0 1 D' 1 1 1 1 0 D' 3

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S J C K R Q Q DEV1 S J C K R Q Q DEV1 S J C K R Q Q DEV1 S J C K R Q Q DEV1 A0 CLk A1 12 Clear A3 Increment A2 Carry Ryan Zanski
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