The following answer record has some suggestions that can help resolve issues with designs not behaving as expected in hardware.
NOTE: This Answer Record is part of the Xilinx 7 Series FPGA Solution Center (Xilinx Answer 46370). The Xilinx 7 Series FPGA Solution Center is available to address all questions related to 7 Series devices. Whether you are starting a new design with 7 Series FPGAs or troubleshooting a problem, use the 7 Series FPGA Solution Center to guide you to the right information.
Below are somesuggestions that can help debug issues where a design behaves differently in hardware than expected
If you still cannot resolve any implementation related fabric issues, please open up a case with Xilinx Technical Support (http://www.xilinx.com/support/clearexpress/websupport.htm)