ICC code coverage constant values

 Hi,

I have a problem with the code coverage of constant values in my design.

In unit_one another one is instanciated like this:

unit_two : unit_two_name   

generic map (
      A => "00110010000",
      B => "01010011100")
    port map (
      clk => clk,
      rst_n => rst_n,
      C  => C,
      D  => D,
      E  => E      );

I'm working with a testbench for unit_one.

Incisive comprehensive coverage (ICC) shows something like this in its expression report:

  Line    Index  Coverage         Expression description
--------------------------------------------------------------------------------
   30 (   7)  25% (1/4)         F := F xor B;

                     F xor B          

              <--1--->    <----2----->

            index  hit | <1> <2>
          xor ----------------------
             (   1)    0 |  0   0  
             (   2)    0 |  0   1  
             (   3)    0 |  1   0 

Because of the constant values of A and B I can never reach the marked values.

The code coverage is now 98% but can I get 100% without marking out something?

What is the best way to deal with this problem?

Best regards,

Binky

 edit:

is it possible to exclude the embedded unit_two from icc?  The coverage for unit_two with its additional testbench is ok. The problem is only in higher levels of the design hirarchie, when unit_two is embeded.