8-Bit Bidirectional Shift Register

Scenario

Design an 8-bit shift register that can shift data left or right based on a control signal. The register uses D flip-flops and 2:1 multiplexers to select the next state input from either the left neighbor (for right shift) or right neighbor (for left shift), with serial inputs provided for end bits.

Key decisions

• Use D type flip-flops for state storage.
• Use 2:1 multiplexers to select between shifting directions.
• Assume active-high reset and rising-edge clock.
• Declare all inputs and outputs explicitly for clarity.

When to reuse this

When a sequential circuit requires bidirectional serial data movement, such as in serial communication interfaces, data storage, or arithmetic operations, this diagram can be adapted by changing the bit width and control signals.