UCD9248: can't connect Fusion Digital Power Designer to Xilinx KC705

Hello, the USB-to-GPIO adapter should have a green LED lit to indicate it is powered on and operational. Do you see the green LED on the side of the device being lit? If not, you could check if the port is powered, etc... Otherwise it might indicate a faulty unit.

What "USB-to-GPIO" adapter? I thought this works through the USB port on the KC705 board?

Ok. I think we found the problem. The Fusion Digital Power Designer software is designed to work with this USB to GPIO dongle. https://www.ti.com/tool/USB-TO-GPIO

As far as I know, the USB port on the Xilinx board itself is for UART communication. I believe there should be a jumper or connector to connect to the I2C SDA and SCL lines with the dongle somewhere on the Xilinx eval kit.

Xilinx seems to think that I can just do this through the USB port on the KC705. The FPGA on the KC705 is connected to the PMBus.

I've not heard about this before, and I did not believe it would be unless they had a TUSB3210PM device on the board, which is the device inside the USB-to-GPIO dongle..

I think it may be possible to issue I2C transactions over the UART. But the Fusion  GUI would not support this.