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Hi all,When do data-oriented functional coverage, can we put the covergroup in transaction class directly? And is there any short guideline how to do?For example,I have transaction define class like://-----------class video_pkg_c; rand bit [7:0] opcode_1; rand bit [7:0] opcode_2; rand bit [15:0] data; //---- // can I add covergroup here? //----endclassclass video_pkg_driver; ... ... video_pkg_c video_pkg; video_pkg = new(); rand_result = video_pkg.randomize(); ... ...endclass//-----------I use IUS583.Best regards,Davy
Hi all,When do data-oriented functional coverage, can we put the covergroup in transaction class directly? And is there any short guideline how to do?================== I would highly recommend to avoid this. This is because, coverage ismore or less a "static" view of your verification progress and nottruly as dynamic as the transactions themselves are. I usually createa separate coverage element and hook it up. Agreed there is somerepetition in work - especially for long transaction descriptors, butone can automate it, write some script or use SV struct etc. to easethe pain.VMM also recommends some thing similar, it prefers to associatecoverage with the transactors. Another rule/guideline is "cover asclose to DUT as possible".This is b'cos, even though a packet got generated at a high levelgenerator, perhaps due to the fact that particular port was inblocking mode (a random configuration setting), the packets never wentinto the DUT. This may or may not be the desired thing. By having thetransactor tell us "when to sample" we are sure that we are coveringat the correct place. Imagine creating 10K transactions, you don'tneed 10K coverage objects as well - you simply need a "count" of whatkind of packets (Type, length, CRC etc.) went in and how many of them.This is what I refer to as "pseudo-static" item in the verificationenvironment.The hook up of coverage class to the transactor is an interestingtopic. In VMM one can use callbacks or vmm_channel::tee(). In AVM onecan use analysis ports to do this. Not sure of in uRM, some thingsimilar exists there? If we had AOP, then that would help here aswell.HTHAjeetha, CVCwww.noveldv.com
Hi,Covergroups in transactions are usually not recommended. Classes in SV are often copied (cloned) when propagated through your testbench, e.g. when sending to the DUT and the scoreboard at the same time. This may result in counting each sampling event multiple times.The correct way is sampling the coverage using a monitor which is a singleton object. It will detect the sampling event from the signals and collect the coverage only on "real" transactions that actually made it to the DUT.Gabi