Hi Idriss,

The big difference between normal Verilog signals and wreal is that there is no standard resolution function for wreal. Cadence has created a few proprietary extensions that can help you to make bidirectional wreal ports.

Code:

module switch(a, b, s);
  inout a, b;
  input s;
  wreal a, b;
  wire s;

  real sigA, sigB;

  always @(a or b or s) begin
    sigA = a;
    sigB = b;
    if (s == 1'b1)
	case (1)
	(a === `wrealZState && b !== `wrealZState)
	  sigA = b;
	(a !== `wrealZState && b === `wrealZState)
	  sigB = a;
	endcase
  end

  assign a = sigA;
  assign b = sigB;

endmodule 

This is the general idea, anyway. I have not actually tested the above code, I'll leave that up to you. The whole point here is that the special symbols `wrealZState and `wrealXState are used to make the wreals behave similar to other four-state logic in Verilog.

Cheers,
Marq