I am looking for what value of resistor the diff_term instantiation of LVDS inputs in the UCF will set. I have tried downloading the IBIS files from xilinx download site however the only files contained in it are .pkg extentions which i cant open on a windows based machine.
The ultimate goal is that i need a 100 ohm termination resistor in parallel to work with my ADC
Enable DIFF_TERM on a IBUFDS will turn on a 100 ohm termination. This should be clear from the content in the Spartan-6 SelectIO User Guide UG381.
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