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SFU - CMPT 150 - Solutions - Assignments - 3

SFU - CMPT 150 - Solutions - Assignments - 3 - c A.H.Dixon...

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c A.H.Dixon CMPT 150 : Assignment 3 SOLUTION 1 Due 23:59 Wednesday, February 27, 2008 1. 2 × 1 MUX: d0 d1 s m 2. T-flip-flop with synchronous clear (clr): Q T Q R 0 m s 1 T clr R
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c A.H.Dixon CMPT 150 : Assignment 3 SOLUTION 2 3. (a) A mod-2 counter using only a T flip-flop. (b) A mod-4 counter using only two T flip-flops and one 2-input AND gate. (c) A mod-8 counter using only three T flip-flops and two 2-input AND gates. NOTE: Assume a single control input “ up ” for each of these circuits (other than the clk ” input), such that the circuits increment on the positive edge of the clock input, only if up = 1 . mod-8 counter T T T T T T Q Q Q Q Q Q up up up Q0 Q1 Q2 Q0 Q1 Q0 mod-2 counter mod-4 counter 4. An entity that provides one bit of storage and can be used to construct incrementing counters of any size through chaining: clk clr R up clr R c Q T Q
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c A.H.Dixon CMPT 150 : Assignment 3 SOLUTION 3 5. Using the component from the previous question and additional gates if necessary,
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