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What is VHDL?

VHDL is a Hardware Definition Language (HDL) which is in use since 80’s and standardized by IEEE.

VHDL  stands for VHSIC Hardware Definition Language where VHSIC stands for Very High Speed Integrated Circuit.

VHDL can be used for two purposes:

  1. Synthesis
  2. Simulation

Below you can find a simple VHDL code which defines an AND gate with two inputs.

library IEEE;

entity AND_GATE is
    Port ( A : in STD_LOGIC;
              B : in STD_LOGIC;
              C : out STD_LOGIC);

architecture Behavioral of AND_GATE is
        C <= A AND B;
   end Behavioral;

VHDL is similar to software programming languages in terms of style and syntax. But in oppose to those languages VHDL includes many hardware specific constructs.

The following pages will define VHDL in more detail and help you to get familiar with VHDL.

Now let’s a quick and neat look at the VHDL terminology to understand which term means what.

Note: In VHDL Dictionary section of this web site, you can find explanations and simple examples for all the VHDL codes. We believe this section will be very useful as a reference to VHDL designers.




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