The USB Host Port controller is fully compliant with the Enhanced HCI specification. It handles the Open HCI (Open Host Controller Interface) protocol as well as the Enhanced HCI (Enhanced Host Controller Interface) protocol. The USB Host Port User interface can be found in the Enhanced HCI Rev 1.0 Specification.
Figure 1. Micro-AB Type USB Connector J9
Location
The figure below shows the USB implementation on the USB-A port terminated on a Micro-AB type USB connector.
Figure 2. USB-A and VBUS Detection
The table below describes the pin assignment of the USB-B downstream connectors.
| Pin No | Mnemonic | Signal Description |
|---|---|---|
| 1 | VBUS | 5V power |
| 2 | DM | Data minus |
| 3 | DP | Data plus |
| 4 | NC | Not connected |
| 5 | GND | Common ground |