2021/09/16
2015/02 Rev.A 2015/09 Rev.B Fixed footprints, see TODO.txt. 2016/12 Rev.C Fixed X'tal footprints and value of capacitors and resistor. 2019/06 Rev.D Update footprint with rounded pads 2019/09 Rev.E Change QFP44 footprint and solder mask parameters 2020/02 Rev.F Change Xtal footprint and paste clearance 2020/12 Rev.G Remove LED
MAX3421E datasheet: http://datasheets.maximintegrated.com/en/ds/MAX3421E.pdf
MAX3421E kicad library: https://github.com/dominicgs/BeagleDancer/blob/master/hardware/lib/beagledancer.lib
Circuit@HOME USB Host Shield http://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino
3.3V Teensy https://www.pjrc.com/teensy/3volt.html
Host Shield library: https://github.com/felis/USB_Host_Shield_2.0
Host Shield library debug output: USB_HOST_SERIAL https://github.com/felis/USB_Host_Shield_2.0/blob/master/settings.h