In reply to dave_59:
Thanks for your reply, Dave.
1.“only using them for synthesis which requires the directional information”, can you elaborate a
little bit on this?
2.after changing intf.mp.signal to intf.signal in module cnt4, there is no compilation issue now.
3.why during 0~6ns, it shows 'X on the waveform? Is there a better way to drive synchronized signal so that it gets initial value?