Have you tried looking at www.rapidIO.org and www.mc.com. I have only used the mercury software and wrote some programs but haven't used the raceway in anger. In our project, the raceway is placed behind the VME rack and used as a high performance switch with the mercury G4 cards, where the deinterleaver, signal detection algorithm etc.. are downloaded to the G4 processor and also the Echotek cards are also placed there. If you look in the eda books section on software radio, this will describe the raceway use in software radio.
thanks for your help, although I am not very clear about your project , I am doing some search on this field , and in the future ,I believe we will have chance to discuss some problems about it! Merry Chrismas!