2 bit up 4 bit counter with D flip flops - VHDL - Stack Overflow
VHDL for FPGA Design/4-Bit Shift Register - Wikibooks, open books for an open world
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VHDL Code for Flipflop - D,JK,SR,T
electronics blog: FPGA VHDL four bit register with load hold behavioural approach circuit test and testbench comparison
4-Bit Universal Shift Register Behavioral Vs. Structural Description Behavioral Description – Behavior model of a shift register Describe the operation. - ppt download
VHDL Code for 4 bit Ring Counter
8 ways to create a shift register in VHDL - VHDLwhiz