FPGAs contain logic resources and routing resources to link them together. I think that, for a given number of logic blocks being used, there would be a % of routing resources being used that link them. Is is possible to know what % of routing resources we are using?
I have heard that sometimes a design may not fit in an FPGA due to limitation of routing resources rather than logic resources. I have also heard that, in rare instances, the FPGA may get physically damaged due to some routing paths getting too hot during device operation. Maybe someone can confirm if this is true.