Shift Registers - General Questions (3)

Ring shift and Johnson counters are:

When an 8-bit serial in/serial out shift register is used for a 20 s time delay, the clock frequency is ________.

What type of register would have a complete binary number shifted in one bit at a time and have all the stored bits shifted out one at a time?

By adding recirculating lines to a 4-bit parallel-in, serial-out shift register, it becomes a ________, ________, and ________-out register.

The group of bits 10110111 is serially shifted (right-most bit first) into an 8-bit parallel output shift register with an initial state 11110000. After two clock pulses, the register contains ________.

In a parallel in/parallel out shift register, D₀ = 1, D₁ = 1, D₂ = 1, and D₃ = 0. After three clock pulses, the data outputs are ________.

When is it important to use a three-state buffer?