How to Create a 4-bit Shift Register
Overview
A shift register is a sequential circuit that stores and shifts data through a series of flip-flops, synchronized by a clock. With some simple modifications, shift registers can support features like parallel loading, data hold, zeroing, and more. This makes it useful for storage, transfer, or conversion. This tips-n-tricks showcases a 4-bit shift register, a basic example that can be scaled as needed.
Requirements
Procedure
Implement the CLB Logic
Configure the CLB to implement flip-flops, OR gates, or equivalent logic for the rising edge detector.
Assign Pins
Connect the input of the shift register to the data source you wish to shift and route the outputs of the shift register to their respective destinations based on your application's requirements.
Verify the Design
Use a debugging tool to confirm the shift register is shifting data correctly and the outputs are functioning as intended.
Results
The results demonstrate the proper operation of the 4-bit shift register. The input signal (D4) is sequentially propagated through the outputs (D0 to D3) with each clock cycle, as expected. Each output reflects the shifted state of the input, confirming the shift register accurately shifts data across its stages.