INST "clki" TNM = "TNM_clk";
NET "clki" PERIOD = 20 ns LOW 50 %;

INST "di" TNM = "testgrp_in";
INST "do" TNM = "testgrp_out";
TIMEGRP "testgrp_in" OFFSET = IN 10 ns BEFORE "clki"  ;
TIMEGRP "testgrp_out" OFFSET = OUT 25 ns AFTER "clki"  ;
#OFFSET = OUT 2 ns BEFORE "clk" TIMEGRP  "TNM_clk"  ;