File:3 bit bi-directional shift register circuit.svg - Wikimedia Commons
Verilog coding: Verilog code for 4-Bit universal shift register:
Vhdl Program For 3 Bit Bidirectional Shift Register - blutera's diary
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Verilog Code For Sipo Shift Register 55+ Pages Explanation in Google Sheet [6mb] - Latest Update - Jasper Study for Exams