04-11-2016, 11:32 AM
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Flip-flop is a 1 bit memory cell which can be used for storing the digital data. To increase the
storage capacity in terms of number of bits, we have to use a group of flip-flop. Such a group of
flip-flop is known as a Register. The n-bit register will consist of n number of flip-flop and it is
capable of storing an n-bit word.
The binary data in a register can be moved within the register from one flip-flop to another. The
registers that allow such data transfers are called as shift registers. There are four mode of
operations of a shift register.
Serial Input Serial Output
Serial Input Parallel Output
Parallel Input Serial Output
Parallel Input Parallel Output
Serial Input Serial Output
Let all the flip-flop be initially in the reset condition i.e. Q3 = Q2 = Q1 = Q0 = 0. If an entry of a four
bit binary number 1 1 1 1 is made into the register, this number should be applied to Din bit with
the LSB bit applied first. The D input of FF-3 i.e. D3 is connected to serial data