Discussion
A shift register is used to
Answer: C
Correct answer: move stored bits one position at each clock pulse
A shift register is a chain of flip-flops in which the output of each feeds the input of the next, so that on every clock pulse the whole pattern of bits moves one position along. The four configurations are named by how data enters and leaves. Serial-in serial-out is used for delay. Serial-in parallel-out converts a bit stream into a word, which is what a receiver does. Parallel-in serial-out does the reverse and is what a transmitter does. Parallel-in parallel-out acts as a simple storage register. Serial-to-parallel conversion is the reason shift registers are fundamental to communications, since data travels serially over a single line but is processed in parallel words. Shifting also performs arithmetic: shifting left multiplies a binary number by two and shifting right divides it by two, which is far cheaper in hardware than a multiplier. Feeding the output back to the input gives a ring or Johnson counter.
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