practice_mod4_soln

practice_mod4_soln - ECE 270 Module 4 Practice Homework...

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ECE 270 – Module 4 Practice Homework -1- Solution © 2006 by D. G. Meyer ______________________________________________________________________________ 1. Draw a circuit that implements the following next state equations (assume each gate has a delay of τ ), where A and B are the inputs to the circuit: X(t+ τ ) = A(t) •Y (t) Y(t+ τ ) =X(t) B (t) ______________________________________________________________________________ 2. Complete the PS-NS Table for the circuit in Problem 1, below: PS PI NS X(t) Y(t) A(t) B(t) X(t+ τ ) Y(t+ τ ) 0 0 0 0 0 1 0 0 0 1 0 0 0 0 1 0 1 1 0 0 1 1 1 0 0 1 0 0 0 1 0 1 0 1 0 0 0 1 1 0 0 1 0 1 1 1 0 0 1 0 0 0 0 0 1 0 0 1 0 1 1 0 1 0 1 0 1 0 1 1 1 1 1 1 0 0 0 0 1 1 0 1 0 1 1 1 1 0 0 0 1 1 1 1 0 1 Y 7486 1 2 3 X 7402 2 3 1 A B

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ECE 270 – Module 4 Practice Homework -2- Solution © 2006 by D. G. Meyer ______________________________________________________________________________ 3. Construct a state transition diagram for the circuit in Problem 1: ______________________________________________________________________________ 4. Fill in the timing chart for the circuit in Problem 1, below. Note the initial conditions. τ A B X Y 0 0 0 1 1 0 1 1 00 01 10 11 d0 00 01 10 11 d1 d0 d1
ECE 270 – Module 4 Practice Homework -3- Solution © 2006 by D. G. Meyer ______________________________________________________________________________ 5. Given the following state transition diagram, complete the timing chart below. Note the initial conditions. AB XY 00 10 00 00 01 d1 01 1d 11 0d 10 10 11 d1 d0 A B X Y

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ECE 270 – Module 4 Practice Homework -4- Solution © 2006 by D. G. Meyer ______________________________________________________________________________ 6. Given the circuit for an S -R latch, below: ______________________________________________________________________________ (a) Write the next state equations (assume each gate has a delay of τ ): Q(t+ τ ) = ______________________________________________ QN(t+ τ ) = _____________________________________________ ______________________________________________________________________________ (b) Complete a PS-NS table: Present State Q(t) QN(t) Present Inputs: S_L(t) R_L(t) 0 0 0 1 1 0 1 1 0 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 0 1 1 1 0 1 1 1 0 1 1 1 1 1 0 0 1 0 0 S_L + QN R_L + Q
ECE 270 – Module 4 Practice Homework -5- Solution © 2006 by D. G. Meyer ______________________________________________________________________________ (c) Construct a state transition diagram: ______________________________________________________________________________ (d) Complete a timing chart (note the initial conditions): S_L R_L Q QN 0 0 0 1 1 0 1 1 d1 dd 00 01 10 11 1d 0d d0

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ECE 270 – Module 4 Practice Homework -6- Solution © 2006 by D. G. Meyer ______________________________________________________________________________ 7. For the following circuit, write the next state equations (for X* and Y*) and draw a state transition diagram:
ECE 270 – Module 4 Practice Homework -7- Solution © 2006 by D. G. Meyer ______________________________________________________________________________ 8. For the following circuit, write the next state equations (for X* and Y*) and draw a state transition diagram:

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ECE 270 – Module 4 Practice Homework -8- Solution © 2006 by D. G. Meyer ______________________________________________________________________________ 9. Complete the state transition diagram, below, for a soda dispensing machine that accepts any combination of nickels, dimes, and quarters which totals \$0.60 (exact change only). Assume this state machine has the following input signals: s A - asserted when a nickel is inserted s B - asserted when a dime is inserted s C - asserted when a quarter is inserted s S - asserted when a soda is selected, i.e., the money deposited is "consumed" by the
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This note was uploaded on 02/12/2012 for the course ECE 270 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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practice_mod4_soln - ECE 270 Module 4 Practice Homework...

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