8 ways to create a shift register in VHDL - VHDLwhiz
VHDL Code for 4 bit Ring Counter
8.5 Registers - Introduction to Digital Systems: Modeling, Synthesis, and Simulation Using VHDL [Book]
4-Bit Universal Shift Register Behavioral Vs. Structural Description Behavioral Description – Behavior model of a shift register Describe the operation. - ppt download
4-Bit Universal Shift Register Behavioral Vs. Structural Description Behavioral Description – Behavior model of a shift register Describe the operation. - ppt download
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electronics blog: FPGA VHDL 4 bit Serial to parallel shift register circuit and test bench comparison Xilinx spartan 3 Waveshare