====== Concurrent procedure call ======
===== concurrent_procedure_call =====
  [ label : ] [ postponed ] procedure_call ;

===== Parents =====
  * entity_statement_part
  * architecture_statement_part
  * block_statement_part

===== Further definitions =====
==== procedure_call ====
''procedure _[[.:bnf#name]] [ ( [[.:bnf#actual_parameter_part]] ) ]''

===== Comment =====
For any concurrent procedure call statement, there is an equivalent process statement.

The equivalent process statement of a concurrent procedure call statement including the keyword **POSTPONED** is a postponed process.

A concurrent procedure call within the statement-part of an **ENTITY** has to be a passive concurrent procedure call.

===== Examples =====
Procedure call without transfer parameters
<code vhdl>a_proc ;</code>

----

Named procedure call with transfer parameters which are linked by position.
<code vhdl>lab : my_proc( sig_1, sig_2, sig_3 ) ;</code>

----

Procedure call with transfer parameters which are linked by explicit assignment.
<code vhdl>
register_proc( ck => clock,
                d => reg_in,
                q => reg_out ) ;
</code>

----

Procedure call with transfer parameters which are linked either by position or by explicit assignment.
<code vhdl>another_proc( sig_1, sig_2, q => sig_3);</code>

----

This example shows that a concurrent procedure call is equal to a process which has a statement part which only contains the procedure call.
<code vhdl>
check_timing( tplh, tphl, clk, d, q ) ;
   -- concurrent procedure call

PROCESS -- corresponding process
BEGIN
   check_timing( tplh, tphl, clk, d, q);
   WAIT ON clk, d, q ;
END PROCESS ;
</code>