Are you interested in creating your own Fin board to connect to the expansion interface of the SHARC Audio Module? This page contains a number some things to help you get started.
The link below contains an Autodesk EAGLE schematic and PCB layout files for a blank SHARC Audio Module Fin with the two 64-pin headers.
The rendering below shows the front and back side of the PCB template.
Autodesk EAGLE is an affordable yet powerful schematic capture and layout tool and used extensively in the maker space. It's free for students and has a subscription fee of $15/month for the standard edition. It's also closely linked with Autodesk Fusion 360 which is a powerful 3D CAD tool that is free for hobbyists and makers.
If you're looking for a low-cost PCB fab to fab for your Fin, check out https://oshpark.com/.
To access the components used in the PCB design, go to File→Export→Libraries when editing the PCB. This will create a new EAGLE library file with the components used in the template design.
The ADSP-SC589 has a rich peripheral set. Despite the fact that many of these are brought out to connectors on the SHARC Audio Module, there are still quite a few GPIO pins and other peripherals that are accessible on the two 64-pin expansion headers of the SHARC Audio Module.
The signals brought out the 64-pin headers are generally not used in other areas of the SHARC Audio Module with a few exceptions: