[Open-graphics] How we compute video clocks

[Dieter]

> First off, we have two source clocks.  One is 133MHz, the other is
> 156.25MHz.  Select one with a mux.
> 
> Next, we have a pre-divider that can divide the clock by any number
> between 1 and 128.  Restrict the range of your divider so that its
> output is in the range of 1MHz to 6.875MHz (330/48).
> 
> Next, we have the DCM that multiplies by 48.
> 
> Finally, we have a post-divider that divides by 1, 2, 4, 8, 16, or 32.

So is the board still doing the jitter bug, or has it moved on to
the polka or perhaps the chicken dance?  Can the board ever be
truely compatible with a cable that only knows the twist (-ed pair)?