VHDL code for flip-flops using behavioral method - full code
D-type Flip Flop Counter or Delay Flip-flop
VHDL Code for 4-Bit Shift Register
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VHDL Code for Flipflop - D,JK,SR,T
VHDL Programming: Design of Serial IN - Serial Out Shift Register using D-Flip Flop (VHDL Code).
Verilog code for D flip-flop - All modeling styles
VHDL coding tips and tricks: Example : 4 bit Johnson Counter with testbench
4-Bit Universal Shift Register Behavioral Vs. Structural Description Behavioral Description – Behavior model of a shift register Describe the operation. - ppt download