VHDL is an acronym for Very High Speed Integrated Circuit Hardware Description Language. It was first developed by the United States Department of Defense to document electronic systems. It was later introduced into commercial industries and adopted as IEEE standard 1076. VHDL allows Electronically Erasable Programmable Read Only Memory controllers to be programmed to perform as a complex logic circuit, making logic circuits cheaper to manufacture and more reliable.

To compile VHDL programs, I would recommend Altera's Quartus software.

VHDL Source Code
25.175MHz to 1Hz Clock Divider
4-Bit Binary to 7-Segment LED Converter
4-Bit Multiplexer
8-Bit ALU
D-Flip Flop
Finite State Machine (Sequence Detector)

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