Functions (Automatic and Static) - 2022.1 English

Vivado Design Suite User Guide: Synthesis (UG901)

Document ID
Release Date
2022.1 English

Functions are similar to tasks, but return a value. The format for a function is:

function data_type function_name(inputs);



endfunction : function_name

The final function_name is optional but does make the code easier to read.

Because the function returns a value, it must either have a return statement or specifically state the function name:

function_name = ....

Like tasks, functions can also be automatic or static.


CAUTION!   Vivado synthesis treats all functions as automatic. However, some simulators might behave differently. Be careful when using these functions with third-party simulators.