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Ex4: Design a counter with 7 flip-flops that goes through the following binary repeated sequence: 0, 1, 3, 7, 6, 4. Show that when binary states 010 and 101 are considered as don't care conditions, the counter may not operate properly. Find a way to correct the design Sol: The number of flip-flops required is three. • Table below shows the desired circuit excitation table. Present Next state state Flip-flop inputs TB TC ABC ABC T₁ 000 001 0 0 1 001 011 0 1 0 010 XXX X X X 011 111 1 1 0 100 000 1 101 XXX X X Xx 110 100 0 1 0 111 110 0 01

Ex4: Design a counter with 7 flip-flops that goes through the following binary repeated sequence: 0, 1, 3, 7, 6, 4. Show that when binary states 010 and 101 are considered as don't care conditions, the counter may not operate properly. Find a way to correct the design Sol: The number of flip-flops required is three. • Table below shows the desired circuit excitation table. Present Next state state Flip-flop inputs TB TC ABC ABC T₁ 000 001 0 0 1 001 011 0 1 0 010 XXX X X X 011 111 1 1 0 100 000 1 101 XXX X X Xx 110 100 0 1 0 111 110 0 01

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Ex4: Design a counter with 7 flip-flops that goes through the following binary repeated sequence: 0, 1, 3, 7, 6, 4. Show that when binary states 010 and 101 are considered as don't care conditions, the counter may not operate properly. Find a way to correct the design. Sol: • The number of flip-flops required is three. • Table below shows the desired circuit excitation table. Present Next state Flip-flop inputs state ABC ABC TA TB Tc 000 001 0 0 1 001 011 0 1 0 010 XXX X X X 111 1 1 0 011 100 000 1 1 0 XXX X X X 101 110 100 0 1 0 111 110 0 0 1 complete the solution Complete the solution using electrical circuit diagrams
Transcribed Image Text:Ex4: Design a counter with 7 flip-flops that goes through the following binary repeated sequence: 0, 1, 3, 7, 6, 4. Show that when binary states 010 and 101 are considered as don't care conditions, the counter may not operate properly. Find a way to correct the design. Sol: • The number of flip-flops required is three. • Table below shows the desired circuit excitation table. Present Next state Flip-flop inputs state ABC ABC TA TB Tc 000 001 0 0 1 001 011 0 1 0 010 XXX X X X 111 1 1 0 011 100 000 1 1 0 XXX X X X 101 110 100 0 1 0 111 110 0 0 1 complete the solution Complete the solution using electrical circuit diagrams
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