Question

1) Explain the oprerating principle of left-rotating, right rotating shift register by sketching the circuit and
timing diagram for 4-bit register configurations?

Answer 1

timing diagram show how to move bit in registor.

A shift register basically consists of several single bit “D-Type Data Latches”, one for each data bit, either a logic “0” or a “1”, connected together in a serial type daisy-chain arrangement so that the output from one data latch becomes the input of the next latch and so on

there are 4 type of sift registor

• Serial-in to Parallel-out (SIPO)  -  the register is loaded with serial data, one bit at a time, with the stored data being available at the output in parallel form.
• Serial-in to Serial-out (SISO)  -  the data is shifted serially “IN” and “OUT” of the register, one bit at a time in either a left or right direction under clock control.
• Parallel-in to Serial-out (PISO)  -  the parallel data is loaded into the register simultaneously and is shifted out of the register serially one bit at a time under clock control.
• Parallel-in to Parallel-out (PIPO)  -  the parallel data is loaded simultaneously into the register, and transferred together to their respective outputs by the same clock pulse.