The following table describes the input and output ports provided from the
clocking network. All ports are optional, with the exception being that at least one input
and one output clock are required. The options selected determine which ports are actually
available to be configured. For example, when PI Control is selected as Fine_PS, the psclk, psen, psincdec, and psdone ports are
exposed. Any port that is not exposed is appropriately tied off or connected to a signal
labeled unused in the delivered source code.