Example Codes in VHDL

    A language cannot be just learn by reading a few tutorials.Its best learn when you try out new things.And for beginners I have written some basic as well as little bit advanced codes.Most of the posts have both the design and a testbench to verify the functionality of the design.Copy these codes and run them.Experiment with the codes and see how its working.Best Of Luck

VHDL  codes for common Combinational Circuits:

A 3 bit Magnitude Comparator using logic gates

Simple 4 : 1 multiplexer using case statements 

Simple 1 : 4 Demultiplexer using case statements 

4 bit comparator with testbench 

4 bit Ripple Carry Adder using basic logic gates 

3 : 8 Decoder using basic logic gates 

VHDL  codes for common Sequential Circuits:

Positive edge triggered JK Flip Flop with reset input

4 bit Synchronous UP counter(with reset) using JK flip-flops 

How to use "generate" keyword for multiple instantiation? 

4 bit Ring Counter with testbench 

4 bit Johnson Counter with testbench 

Examples for Gate Level and Behavior Level Designs 

D Flip-Flop with Asynchronous Clear,Set and Clock Enable 

D Flip-Flop with Synchronous Reset,Set and Clock Enable 

 Some more codes are available here:

A synthesizable delay generator instead of 'wait for' statement 

VHDL code for BCD to 7-segment display converter 

VHDL coding method for Cyclic Reduntancy Check(CRC) 

Usage of components and Port mapping methods

Digital clock in VHDL 

Matrix multiplication in VHDL