When I add the Duty Cycle Distortion macro to my design, the Tdcmino value in the timing reports goes to zero. The macro is used by customers who are running DDR I/O applications at high speeds. The macro replaces the normal path from the DCM to the BUFG and back to the FEEDBACK input with LUTs and general routing. When will the Tdcmino be calculated correctly?
This problem has been fixed in the latest 6.2i Service Pack available at:
The first service pack containing the fix is 6.2i Service Pack 6.2i