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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Repeat Problem 19 for the sequence 01111110 that is used in a different communication network protocol.
Problem 19
A Universal Serial Bus (USB) communication link requires a circuit that produces the sequence 00000001. You are to design a synchronous sequential circuit that starts producing this sequence for input E = 1. Once the sequence starts, it completes. If E = 1, during the last output in the sequence, the sequence repeats. Otherwise, if E = 0, the output remains constant at 1.
(a) Draw the Moore state diagram for the circuit.
(b) Find the state table and make a state assignment.
(c) Design the circuit using D flip-flops and logic gates. A reset should be included to place the circuit in the appropriate initial state at which E is examined to determine if the sequence of constant 1s is to be produced.
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