![]() To give an idea of the shifting pattern, imagine that the register holds 0000 (so all storage slots are empty). The data is stored after each on the 'Q' output, so there are four storage 'slots' available in this arrangement, hence it is a 4-bit Register. ![]() ![]() 'Data In') is shifted into the first 's output. At each advance, the bit on the far left (i.e. The data string is presented at 'Data In', and is shifted right one stage each time 'Data Advance' is brought. Serial-in serial-out (SISO) Destructive readout 0 0 0 0 1 0 0 0 0 1 0 0 1 0 1 0 1 1 0 1 0 1 1 0 0 0 1 1 0 0 0 1 0 0 0 0 These are the simplest kind of shift registers.The serial input and last output of a shift register can also be connected to create a 'circular shift register'. There are also 'bidirectional' shift registers which allow shifting in both directions: L→R or R→L. There are also types that have both serial and parallel input and types with serial and parallel output. These are often configured as 'serial-in, parallel-out' (SIPO) or as 'parallel-in, serial-out' (PISO). Shift registers can have both and inputs and outputs. The SISO shift register is one of the simplest of the four configurations as it has only three connections, the serial input (SI) which determines what enters the left hand flip-flop, the serial output (SO) which is taken from the output of the right hand flip-flop and the sequencing clock signal (Clk).
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