====== Variable assignment  ... := ..." ======
===== variable_assignment_statement =====
<code vhdl>[ label : ] target := expression ;</code>

===== Parents =====
  * function_statement_part
  * procedure_statement_part
  * process_statement_part

===== Further definitions =====
==== label ====
  * [[.:bnf#identifier]]

==== target ====
  * [[.:bnf#name]]
  * [[.:bnf#aggregate]]

==== expression ====
  * [[.:bnf#relation]] { and relation }
  * relation { or relation }
  * relation { xor relation }
  * relation [ nand relation ]
  * relation [ nor relation ]
  * relation { xnor relation }

===== Examples =====
//var// receives the value //0// .
<code vhdl>
var := 0;
</code>

----

//a// receives the current value of //b// .
<code vhdl>a := b;</code>

----

//a// receives the result of the function //my_function// as a new value.
<code vhdl>
a := my_function ( data, 4 );
</code>

----

//str_a// is assigned a string which consists of three interlinked parts.
<code vhdl>
str_a := "Mein Name ist "
        & get_name & ", und Ihrer ?";
</code>

----

//var_int// receives the result of the right equation as its value.
<code vhdl>
var_int := my_function( data, 4 ) + 4 * a_function(var_int) - 2 ** data;
</code>