Virtex 2 Fastest MUX performance

For the xc2v1000-5, the equation

tcko + tnet + tif5x + tdxck = 493 + tnet + 826 (worst case) + 322 = tnet + 1641 ps

This allows 135 ps for routing to meet the 563 MHz which - although small - may be very reasonable for (nearly) adjacent slices in the -5 speed grade. Also, the "worst case" number for tif5x may not be needed for a simple 4:1 mux.

If you try to compile your own registered 4:1 mux, you should be able to see these numbers broken down to the timing elements like I've shown above in the Timing Analyzer, at least when the appropriate "View" options are selected.

I got the numbers from the "speedprint" utility that's command-line accessible on our Solaris platform.

mux