shift register

shift register is Sequential circuit that is used to implement digital memory

I made serial input serial output 4 bit shift register using D flip flop (for practice )

table 1000 0100 0010 0001

bit 1 shifting from left to right

one d flip flop store one bit so I used 4 D flip flop for 4 bit shift register

1) can anyone explain the operation of 4 flip flop means function table

I believe that the key to understanding the serial input/serial output shift register is through the use of timing diagrams.
Here is a document I found that may help. https://maxwell.ict.griffith.edu.au/yg/teaching/dns/dns_module3_p3.pdf