The syntax for a task declaration is:
task name (ports);
[optional declarations];
statements;
endtask
Following are the two types of tasks:
• Static task : Declarations retain their previous values the next time the task is called.
• Automatic task : Declarations do not retain previous values.
CAUTION! Be careful when using these tasks; Vivado synthesis treats all tasks as automatic.
Many simulators default to static tasks if the static or automatic is not specified, so there is a chance of simulation mismatches. The way to specify a task as automatic or static is the following:
task automatic my_mult... //or
task static my_mult ...