I would like to interface to the SI5338 EVK via the USB using the same assemblies as the clockbuilder desktop software to configure the board programmatically. Are the API's for the .net assemblies available?
Sorry, but we do not provide an API for the Si5338-EVB. If you wish to develop your own code to talk to a Si5338 over I2C bus using your own hardware, you can use our app note AN428 at the link below to assist in the development.
Do you have the firmware for the SI5338 EVK? I have read through the appnote and it is not up to date or complete. For example, my card uses a 340 chip rather than 300. I have experimented with the firmware in the past and found that the programming of the 5338 is not straight forward on this board. It seems that there are pre and post programming steps that are not outlined in the appnote.
The conversation I started a year ago is here: