A Microchip SAMD11 debug controller will allow consumer configuration of the FPGA and presents several diagnostic interfaces: An entire, consumer-programmable JTAG controller able to configuring the FPGA and speaking by means of JTAG with user models I shortly started referring to the concept as "usbstar" in my private notes and https://cynthion84051.verybigblog.com/32429453/the-best-side-of-cynthion