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merging issues in functional coverage

hariharans

 Dear Sir/Madam

I am having problems in merging the databases generated for functional coverage. Individually tests show that the individual cvergroups/coverpoins show higher values, but when merged these values fall. also by experimentation i foudn that these happen to bethe values accumulated for the last test that gets merged.

tool; IUS8.2, ICC

commands in irun:

  @irun -coverage U -covoverwrite -covdut tb_top  -covfile ./cov_spec -covtest $(TESTCASENAME) -covworkdir ../simulation/coverage

and/or

@irun -coverage all -covoverwrite -covdut tb_top  -covfile ./cov_spec -covtest $(TESTCASENAME) -covworkdir ../simulation/coverage

commands in icc:

set_dut_modules DUT_TOP
merge ./coverage/design/test1 ./coverage/design/test2 -output all_tests
load_test ./coverage/design/all_tests
report_html  * > ./coverage/report.html
view_graphics

 Could you guide me in this regard

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