Video Development Board Schematic

I am working on a PCB with a Cyclone III at it's core and AES3/EBU inputs and outputs. I do not have the Cyclone II or Stratix II GX video development board but it looks like they both have AES3/EBU interfaces. I am trying to find a schematic for either one of those boards to see how this was implemented. I have found documentation for just about any other Altera development board but these two. This may be by design, but I was wondering if anyone had any thoughts of where I could find information about the digital audio circuits. Thanks.