[sv-ec] RE: [sv-cc] Coverpoint bins & functional coverage

Cliff,

As far as I can tell, there is no mechanism, language or API, to access
individual bin counts, or even individual coverpoints. There is only the
get_coverage method that can be used on an instance of a covergroup, or
across all instances using the :: operator. That method only gives you
the total number of bins that have reached the at_least threshold. 

Currently, the only way to code for what you would like is to create a
separate covergroup for the specific purpose you want the testbench to
react to.

It would be straightforward to extend get_coverage() to work on
individual, explicitly named coverpoints, since their naming conventions
are consistent with members of structs or classes. But naming of bins
gets complicated, especially when defining cross coverage.

Dave




> -----Original Message-----
> From: owner-sv-cc@eda.org [mailto:owner-sv-cc@eda.org] On Behalf Of
> Clifford E. Cummings
> Sent: Friday, July 08, 2005 10:54 PM
> To: sv-ec@eda.org; sv-ac@eda.org; sv-cc@eda.org
> Subject: [sv-cc] Coverpoint bins & functional coverage
> 
> Hi, All -
> 
> A question for all you smart coverage experts using SystemVerilog
coverage
> capabilities.
> 
> *       Coverpoint bins
> 
> Can I assume that the coverpoint bins are integers and that I can do
> random
> functional stimulus generation based on the comparisons to count
values in
> the coverpoint bins? (Keep generating more random stimulus until I see
a
> coverpoint bin == 2?)
> 
> I know that coverpoints and covergroups are used by vendor tools to
report
> functional coverage information, but since the bins are already
keeping
> track of how many times a coverpoint has been seen, it seems like I
should
> be able to loop until I see certain coverpoints incremented.
> 
> If I can do this, what will the hierarchical name be for the
coverpoints?
> (covergourp_instance_name.bin_name??)
> 
> Am I missing something fundamental in these questions?
> 
> Regards -  Cliff
> 
> 
> ----------------------------------------------------
> Cliff Cummings - Sunburst Design, Inc.
> 14314 SW Allen Blvd., PMB 501, Beaverton, OR 97005
> Phone: 503-641-8446 / FAX: 503-641-8486
> cliffc@sunburst-design.com / www.sunburst-design.com
> Expert Verilog, SystemVerilog, Synthesis and Verification Training
> 
>