covered -D score -vcd dump.vcd -cdd cov.cdd

Covered covered-0.7.10 -- Verilog Code Coverage Utility
Written by Trevor Williams  (phase1geo@gmail.com)
Freely distributable under the GPL license

Scoring VCD dumpfile dump.vcd...
========  Reading in database cov.cdd  ========

In db_read, file: cov.cdd, mode: 0
Instance list:
-----------------------------------
ERROR!  CDD file was found to be empty (file: db.c, line: 718)