I have a component which functions on a one line communication standard that I wish to
interface with the 5509A DSK evaluation board from spectrum digital. The component I wish to
interface uses parasitic power so all I need to supply it is a data line and ground.
However the board does not have any standard simple communication methods available as the
GPI/O ports are all used. What is available is a daughter card slot which feeds through the on
board CPLD.  Now the daughter card interface contains some input/output (FSX) pins. Would it be
possible to utilize these connections to communicated with this device? If so what might be
some steps needed to set up these pins for such communication?

The board also contains GPI/O tied to a set of LED's, it would be possible for me to solder
these connections to provide a communication point but I would rather avoid this.

Thanks for any suggestions!