The EVM board uses an ADAU1761 for the analog I/O as this maintains compatibility with the Analog Device's A2B EVM boards. If not using theClockworks EVM board can be used as a SigmaDSP development platform, and the A2B module header on the Clockworks EVM provides easy access to the I2S lines if needed to interface with your own hardware.
The EVM has a 10 pin .1" header for attaching the USBi pod to the board.
With the A2B module removed the ADAU1761 will need to be supplied with its master clock (12.288 MHz is what is normally used). There are two ways to do that:
There are more details in the Clockworks manual, but here's two pictures that give you a better idea of the two choices.
PCB location for adding oscillator for using board without A2B
Oscillator with wires attached plugged in to the EVM