If violations are found, the DRC window opens, as shown in the following figure. The DRC window shows the rule violations, grouped under the various rule categories defined in the Report DRC dialog box. The rule violations are also categorized by severity and are color coded for quick review as follows:
- Advisory
- Provides general status and feedback on design processing.
- Warning
- Indicates that design results might be sub-optimal, because constraints or
specifications might not be applied as intended.
- Critical warning
- Indicates that certain user input or constraints will not be applied or do
not adhere to best practices. Xilinx highly
recommends that you examine these issues and make changes.
Note: Critical warnings are promoted to errors during bitstream generation. - Error
- Indicates an issue that renders design results unusable and cannot be
resolved without your intervention. The design flow stops.
Tip: You can toggle the Hide Warnings
and Informational Messages toolbar button 
to turn off warnings and informational messages to see only
the errors reported.
to turn off warnings and informational messages to see only
the errors reported.Figure 1. DRC Violations
