Does Xilinx provide package thermal models?
Xilinx offers package thermal models for the Virtex-4 family. Icepack and Flotherm formats are available. From the Download Center Web page in the "Select a Download Type" pull-down menu, select "Package Thermal Models":
Refer to the documentation delivered with the models for more information on supported formats and usage.
To request models for other device families, open an online WebCase with Xilinx Customer Support at: