8.5 Registers - Introduction to Digital Systems: Modeling, Synthesis, and Simulation Using VHDL [Book]
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VHDL Programming: Design of Serial IN - Serial Out Shift Register using D-Flip Flop (VHDL Code).
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ECE 545 Lecture 7 Behavioral Modeling of Sequential-Circuit Building Blocks Mixing Design Styles Modeling of Circuits with a Regular Structure. - ppt download
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VHDL code for D Flip Flop - FPGA4student.com
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