In reply to birdluo:
Maybe I should change the way of thinking.
I write a component of uvm to collect the cover information that meet my requirement.
when a testcase simulation ends, the cover information will be saved in the enviroment.
when the regress finish, the cover information of every case in enviroment will merge.
there should be a format of cover infomation that ead tool can parse.
are there format standard for cover info?