Improving the performance of LVDS DDR at 200MHz

Oh, and report_skew is sometimes easier to look at, but setup and hold is the best methodology. Skew measures all combinations of outputs, i.e. worst case rise/fall of clock and data. Setup and hold knows that data being captured on the rising edge externally only needs to be analyzed against the rising edge of the clock being sent off chip, and vice-versa. It doesn't analyse combinations that aren't real. I haven't fully analyzed it, but thought setup/hold analysis might buy you a few picoseconds. (Skew also doesn't relate to the clock, i.e. it's skew across the whole bus, where you don't care about skew between two data ports, just skew between the data and the clock. That definitely should buy you something.)