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How to generate coverage in VCS (SNPS) , QUESTA and NC

MODELSIM or QUESTA:

STEP1: Compile your design files with your selected coverage

QuestaSim > vlog +cover -f design_file_list

+cover [=s b c e f t x] Enable code coverage metrics by specifying one or more of the characters:

s - Statement

b - Branch
c - Condition
e - Expression
f - Fsm
t - Toggle
x - Extended toggle
Note: If no character is specified, sbceft is the default.

STEP2: Simulate with the coverage option

QuestaSim > vsim -coverage file_testbench.v

and the run -all

OR,

You can enable it using GUI Mode also.

Go to Compile > Compile Options and select the Coverage tab.Another option is,you have to just right-click on your design file at "Project" and choose "Properties". Now, you can see coverage tab. After running the simulation and you will be able to see the coverage tabs for analysis.

If you are running regression and you have to save the coverage report of the first test (UCDB file) and merge to the next UCDB of the next test till the regression finishes.And finally you will be able to the see total Code Coverage.

vsim -c -do "coverage save -onexit .ucdb ; run -all;exit" -coverage -voptargs="+cover=bcfst"

Here we tell vsim to
1. Enable code coverage (-coverage),
2. The types of coverage to collect (via -voptargs=+cover= bcefst").
3. To produce a coverage database file on the exit of simulation (do "coverage save -onexit coverage.ucdb)
4. Continue the step1 and Step2 till the regression ends

STEP3:
Further if you have multiple coverage databases, you can merge them into a single database by using:
vcover merge .ucdb .ucdb ... .ucdb .ucdb

The finally you can generate a HTML report:
vcover report -html -htmldir -verbose -threshL 50 -threshH 90 <ucdbFileResult>.ucdb

NC SIM
ncverilog +nccoverage+all +nccov58 +nccovworkdir+cov_work +nclexpragma +nccovtest+ +nccovoverwrite +nccovdut+worklib.dut_top -T test_top.sv

1. For switching coverage ON : Use +nccovfile+dut_cov.txt while compiling. //*********************dut_cov.txt****************//
select_coverage -all -module top
.......
select_functional
select_fsm
//************************************************//
Note : During simulation use : covoverwrite -covtest mycov.cov

2. To view coverage:
iccr -keywords+detail iccr1.cmd OR

iccr -keywords+summary iccr2.cmd OR

iccr -keywords+dontmerge iccr3.cmd

//********************* iccr1.cmd **********************//

merge cov_work/design/test* -output merged_dir

reset_coverage
load_test cov_work/design/merged_dir report_detail -instance -betsafd -cgopt top... > detail.rpt

//********************* iccr2.cmd **********************//

merge cov_work/design/test* -output merged_dir
reset_coverage
load_test cov_work/design/merged_dir report_summary -instance -cgopt top... > summary.rpt

//********************* iccr3.cmd **********************//

load_test cov_work/design/*
report_summary -instance -cgopt top... > summary.rpt

VCS

1. To generate functional coverage

% urg -dir simv.vdb

2. To generate code coverage

% vcs -cm_pp -cm_dir simv.cm -cm_name XXX -cm_report summary

Nguồn: Genk.vn