Shift Registers

Q1: On the fifth clock pulse, a 4-bit Johnson sequence is Q0 = 0, Q1 = 1, Q2 = 1, and Q3 = 1. On the sixth clock pulse, the sequence is ________.

A Q0 = 0, Q1 = 0, Q2 = 1, Q3 = 1

B Q0 = 0, Q1 = 0, Q2 = 0, Q3 = 1

C Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 0

D Q0 = 1, Q1 = 0, Q2 = 0, Q3 = 0

ANS:C - Q0 = 0, Q1 = 0, Q2 = 1, Q3 = 1

Johnson counter.

Reset -- 0000
1 -- 1000
2 -- 1100
3 -- 1110
4 -- 1111
5 -- 0111
6 -- 0011
7 -- 0001
8 -- 0000



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