USB-C
The I/O Board is connected to the motherboard through a non-standard USB Type C connector. The I/O Board provides a +24V power to the motherboard through the VBUS lines of the USB-C connector.
| Signal | Pin | Pin | Signal |
|---|---|---|---|
| GND | A1 | B12 | GND |
| USB 3.0 TX1+ | A2 | B11 | USB 3.0 RX1+ |
| USB 3.0 TX1– | A3 | B10 | USB 3.0 RX1– |
| +V (24V) | A4 | B9 | +V (24V) |
| CC1 (GPIO1) | A5 | B8 | SBU2 |
| USB 2.0 A D+ | A6 | B7 | USB 2.0 B D– |
| USB 2.0 A D– | A7 | B6 | USB 2.0 B D+ |
| SBU1 | A8 | B5 | CC2 (GPIO2) |
| +V (24V) | A9 | B4 | +V (24V) |
| Display Port | A10 | B3 | Display Port |
| Display Port | A11 | B2 | Display Port |
| GND | A12 | B1 | GND |
Since reversibility is not required, the CC1 and CC2 signals will be re-purposed for the following functions:
| Signal | Pin | Function |
|---|---|---|
| CC1 (GPIO1) | A5 | Power Status from Motherboard |
| CC2 (GPIO2) | B5 | Display Port Hot Plug Detect |
