Shift Registers » Exercise – 1
21. If an 8bit ring counter has an initial state 10111110, what is the state after the fourth clock pulse?
(a) 11101011
(b) 00010111
(c) 11110000
(d) 00000000
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 Shift Registers » Exercise  112. On the third clock pulse, a 4bit Johnson sequence is Q0 = 1, Q1 = 1, Q2 = 1, and Q3 = 0. On the fourth clock pulse, the sequence is ________. (a) Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 1 (b) Q0 = 1, Q1 = 1, Q2 = 0, Q3 = 0 (c) Q0 = 1, Q1 = 0, Q2 = 0, Q3 = 0 (d) Q0 = 0, Q1 = 0, Q2 = 0, Q3 = 0