Functional Coverage Question

 I have 2 coverpoints.

 Each coverpoint has auto generated bins as well as user-defined bins.  In pseudo-code, I will describe them as follows:

 cp1: 

     auto_bins,

     userdefined_bin0, userdefined_bin1 ;  

cp2:

     auto_bins,

     userdefined_bin2, userdefined_bin3 ;  

Now, I want to cross cp1 and cp2.  But, in that cross-coverage, I am only interested in crossing the userdefined bins and not the auto_bins. 

cp1_x_cp2:

cross cp1, cp2 {

    userdefined_bin0 intersects with userdefined_bins_2, 3 ;

    userdefined_bin1 intersects with userdefined_bins_2, 3 ;

    **************** This is being achieved but the auto bins are also coming into play.

     *************** How do I ignore the auto bins??

}

Thanks,

 ashfaqh