Declares a signal.

signal TypeName SigName;
signal TypeName SigName = InitialVal;

The signal keyword declares a signal in an entity. The syntax of signal declarations is very similar to port declarations. See port page for more details.

If you wish to combine signal declaration with an implicit process that assigns it, use the link keyword.

Like ports, THDL++ signals can be declared in an arbitrary order and can be grouped together. E.g.:

entity MyEntity
{
	port {...};
	signal
	{
		logic s1, s2;
		logic[8] s3;
	}
	
	...
	
	signal logic[4] s4;
}

entity SubtractAndSquare
{
	port in logic[8] X, Y;
	port out logic[8] Result;
	
	signal typeof(X) tmp;
	
	tmp = X - Y;
	Result = tmp * tmp;
}


entity Testbench
{
	signal logic[8] Counter = 0;
	
	process test()
	{
		Counter++;
	}
}