Cover Group Declaration - 2025.1 English - UG937

covergroup my_cover_group @(posedge aclk);
 m_axi_awlen_cp : coverpoint m_axi_awlen;
 m_axi_awcache_cp : coverpoint m_axi_awcache {
        option.comment = "cp with transition bins";
        bins a1 = (1=>2);
        bins b1 = (1,3=>4,5);
        bins b2[] = (1,3=>4,5);
        bins b3 = (1=>2), ([4:6] => 11,12);
        }
m_axi_bresp_cp : coverpoint m_axi_bresp;
endgroup
my_cover_group obj1 = new();

In this example, you are declaring a covergroup named my_cover_group and the sampling event as posedge aclk. This covergroup contains three coverpoints. You can add the cover group declaration code in the example design.

1. In Tcl Console, invoke the following command:

   current_scope /axi_vip_0__exdes_adv_mst_active_pt_mem__slv_passive/DUT/ex_design/axi_vip_mst

2. Double-click axi_vip_mst scope to see the source code.
   
   
3. The following file path appears in the text editor, copy the path and open the file.

   axi_vip_0_ex/axi_vip_0_ex.ip_user_files/bd/ex_sim/ip/ex_sim_axi_vip_mst_0/sim/ex_sim_axi_vip_mst_0.sv

4. In Tcl Console, invoke the close_sim command to close the simulation running previously.
5. In Tcl Console, invoke the close_project command and exit Vivado IDE.
6. To the file open earlier, add the covergroup declaration before endmodule and save it.
   
   
7. In Windows terminal, invoke the following command to navigate to the script file location and execute ./compile.sh, ./elaborate.sh, and ./simulate.sh to launch simulation.

   cd axi_vip_0_ex/axi_vip_0_ex.sim/sim_adv_mst_active__pt_passive__slv_comb/behav/xsim/

8. Invoke the xsim% run -all and xsim% exit commands to run all and exit the simulation.

The simulation stops after reaching the $finish statement. The AMD Vivado™ simulator has generated the coverage database at the following location with the name (default name) xsim.covdb:

./axi_vip_0_ex.sim/sim_adv_mst_active__pt_passive__slv_comb/behav/xsim/

Invoke the following command to generate a report:

xcrg -report_format html -dir ./xsim.covdb/ -report_dir ./

This will generate a directory with the name functionalCoverageReport, it contains a .html report. The following is the description of an example report:

1. Open dashboard.html file. The file contains details such as command, version, date, and coverage summary that shows only 9.375% of total bins are covered.
   
   
2. Click Groups button.
3. Click the link under group report.
4. You will see a detailed report as shown in the following figure:

This way you can view the coverage and change your test bench/seed value to improve the coverage.