Hi
I am facing an issue when using the -master switch while merging UCDBs. I am using Questa64 10.2C
Let’s say the below are the cover group and cover points I have
[code]**module cvg_mc_fract_pel_h4
(
input logic i_clk,
input common_pkg::slice_ctrls slice_ctrl_i,
input common_pkg::ref_4pel_10bit_t ref_din_i,
input common_pkg::ref_ctrls ref_din_ctrl_i
);
covergroup cg_mc_fract_pel_h4 @(posedge i_clk && ref_din_ctrl_i.vld);
option.per_instance = 1;
bit_depth: coverpoint slice_ctrl_i.bit_depth_8not10
{
bins bit8 = {1};
bins bit10 = {0};
}
part_type: coverpoint ref_din_ctrl_i.part_type
{
bins pu_2Nx2N = {0};
bins pu_2NxN = {1};
bins pu_Nx2N = {2};
bins pu_nxn = {3};
bins pu_2NxnU = {4};
bins pu_2NxnD = {5};
bins pu_nLx2N = {6};
bins pu_nRx2N = {7};
}
cross_parttype_bitdepth_bestvec : cross ref_din_ctrl_i.part_type, slice_ctrl_i.bit_depth_8not10;
endgroup
endmodule**
In the above mentioned code if you see, cover point slice_ctrl_i.bit_depth_8not10 has 2 possible values, namely 0 and 1.
test1 would drive ‘1’ and hence only cover bin8 and test2 would drive ‘0’ and hence cover bin10. Individually when running these tests I see the coverages are fine.
Even when merging when I use the following, I dont see an issue…
cp …/tests/mc_frac_pel_h4/1/results/test-1.ucdb …/coverage/mc_fract_pel_h4/merge.ucdb
vcover merge -verbose -testassociated -out …/coverage/mc_fract_pel_h4/merge.ucdb …/tests/mc_frac_pel_h4/2/results/test-2.ucdb
By using the above mentioned I see the cross coverage happening properly and both bins of cover point slice_ctrl_i.bit_depth_8not10 get hit with all bins of cover point ref_din_ctrl_i.part_type
But when I use test-1.ucdb as “master”, the issue that I see is that cross between bin “bit8” of coverpoint slice_ctrl_i.bit_depth_8not10 is not shown merged with any of the bins of coverpoint ref_din_ctrl_i.part_type.
The commands I used for the above scenario is…
cp …/tests/mc_frac_pel_h4/1/results/test-1.ucdb …/coverage/mc_fract_pel_h4/merge.ucdb
vcover merge -verbose -testassociated -master …/coverage/mc_fract_pel_h4/merge.ucdb -out …/coverage/mc_fract_pel_h4/merge.ucdb …/tests/mc_frac_pel_h4/2/results/test-2.ucdb
I am not sure on what the “-master” switch might be doing to the cross coverage. Could you please help me out here.
Hope I was clear in the explanations. Let me know if anything else is needed.
Best!!
Karthik