When I implement a CPLD design, an error message similar to the following occurs:
"ERROR:Cpld:1064 - Design rules checking error. Fitting process stopped."
This generic error message indicates that the CPLD Fitter did not begin to fit the design because of a violation of the hardware limitations. This error is preceded by another message indicating the cause of the fitting failure, such as too many I/O pins, too many macrocells, or an illegal I/O standard. Check the ISE console window for the error to determine the next course of action.