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Type is a set of values and operations. Each VHDL object must have a type. Because operaitons and assignments can not be done without types.

             type type_name is type_definiton覺;
             type type_name;



type tip1 is (L, H);
type Test is ('0', '1', L, H);


There are four types in VHDL.

The operations that you can do with types are as follows:

There are predefined types in Standard and Std_Logic_ 1164 packages. There can be special types which are defined by users as well. These user defined types can be one of the four types explained above.








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