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componentsvhdl

How to generate different types of component

I have 3 different types of component. For example type0, type1 and type2. They all have the same ports but functions. I want to use a constant like 0, 1 and 3 to put the corresponding component in my top design. I want to know the way to do this.

Best regards

Solution

  • You could use a generate statement, eg:

    G0 : if SOME_CONSTANT = 0 generate
  I0 : type0 ( ...
end generate;
G1 : if SOME_CONSTANT = 1 generate
  I1 : type1 ( ...
end generate;
G2 : if SOME_CONSTANT = 2 generate
  I2 : type2 ( ...
end generate;
-- etc

    If you use VHDL-2008, there is a case-generate statement:

    G : case SOME_CONSTANT generate
  when 0 =>
    I0 : type0 ( ...
  when 1 =>
    I1 : type1 ( ...
  when 2 => 2 
    I2 : type2 ( ...
  -- etc
end generate;