Functions & Procedures

• FUNCTIONS and PROCEDURES are collectively called subprograms.

• They are very similar to a PROCESS , for they are the only pieces of sequential VHDL code, and thus employ the same sequential statements (IF, CASE, and LOOP; WAIT is not allowed).

• PROCESS is intended for immediate use in the main code, FUNCTIONS & PROCEDURES are intended mainly for LIBRARY allocation, that is, their purpose is to store commonly used pieces of code, so they can be reused or shared by other projects.

• A FUNCTION or PROCEDURE can also be installed in the main code itself.


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