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How to Code a Datapath With VHDL

VHDL stands for Virtual Hardware Decryption Language. It is primarily used in mechanical engineering to design electronic automation and to create logic circuits. VHDL supports descending and ascending array's. A VHDL data path determines how data is passed through a system. The data path does not actually create data, it just defines its possible routes. When creating a data path in VHDL, you will need to determine the data path's composition and its architecture.

Instructions

- 1
  Declare your library functions. For example, if you want to declare a standard logic arithmetic function, your code would look like this:
  "library ieee;
  use ieee.std_logic_arith.all;"
- 2
  Define your data path's ports. For example:
  
  ̶0;entity datapath is
  port( clock_dp: in std_logic;
  rst_dp: in std_logic;
  imm_data: in std_logic_vector(15 downto 0);̶1;
  
  Your data path's ports will determine how and where your data flows. You are essentially determining where data is input and where it is output.
- 3
  Close the data path port entry by using the following code:
  ̶0;);
  end datapath;̶1;
- 4
  Determine the architectural structure of your data path. You will need to list the components, what the components are comprised of and how data flows to and from each component. For example, sample code to create a register file would look like this:
  
  ̶0;component<Defines the code as a component> reg_file<defines code as a register file> is<sets the attributes of ̶0;reg_file̶1;.>
  port ( clock : in std_logic;
  rst : in std_logic;̶1;
- 5
  Close the architectural design by ending the structure using "end struct;̶1;.

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