70. Circuit Identification from the behavioural table

The table in the question indicates behaviour of 4-bit bidirectional shift register

• From the behaviour table, observe that the data shifts by one bit position after every positive clock pulse.
• The Shift Control (C) input determines the direction of shifting: C = 1 performs a right shift, while C = 0 performs a left shift.
• The Data Input (D) provides the new serial bit that enters the register during each shift operation.
• This behaviour corresponds to a 4-bit Bidirectional Shift Register.
• A bidirectional shift register can shift stored data in both left and right directions, depending on the shift select input.
• It stores 4 bits of data and updates its contents synchronously on each positive clock edge.
• The serial data input allows new data bits to enter the register while shifting.

Applications: Bidirectional shift registers are used in serial-to-serial data transfer, data buffering, digital communication interfaces, arithmetic shift operations, and data manipulation in microprocessors and embedded systems.