Universal Shift Register Circuit Diagram. The design of a 4 bit universal shift register using multiplexers and flip flops is shown below. Universal shift registers are used as memory elements in computers.
If the register operates with a parallel load and shifts the data towards the right and left then it acts as a universal shift register. The design shown by figure 1 uses n 4 1 multiplexers to drive the input pins of n flip flops in the register which are also connected to clock and clear inputs. A universal shift register is a do everything device in addition to the parallel in parallel out function.
Above we apply four bit of data to a parallel in parallel out shift register at d a d b d c d d.
A bidirectional shift register is capable of shifting in both the directions. That means output of one d flip flop is connected as the input of next d flip flop. In other words a combined design of unidirectional either right or left shift of data bits as in case of siso sipo piso pipo and bidirectional shift register along with parallel load provision is referred to as universal shift register. Universal shift registers are used as memory elements in computers.
