[casper] multiple clock domains

[Rick Raffanti]

Hi Casperians,
Can anyone point me in the right direction for building a simulink 
design with multiple clock domains?  SPecifically, I want to bring in a 
data stream at one rate using an external source-synchronous clock, and 
load it into the 10GbE block at the 156.25 MHz clock that requires.  
From browsing around, I'm thinking I should maybe use the "FromFIFO" 
and "ToFIFO" blocks.
Thanks for any help.
Rick