SPRUIU1D July 2020 – December 2024 DRA821U , DRA821U-Q1
Table 4-39 shows configuration pins assignment to functions when boot mode is the USB mode.
| BOOTMODE Pins | Field | Value | Description | MCU Only=1 Value |
|---|---|---|---|---|
| 6 (7)(1) | Port | 0 | Port 0 | N/A |
| 1 | Reserved | |||
| 5 | Mode | 0 | DFU (USB device firmware upgrade) | N/A |
| 1 | Reserved | |||
| 4 | Lane Swap | 0 | D+/D- lines are not swapped | N/A |
| 1 | D+/D- lines are swapped |
Table 4-40 summarizes the USB pin configuration done by ROM code for USB boot device on port 0.
| Device Pin | Module Signal | Pull Enable | Pull Direction | Driver Index | Rx En/Dis | Tx En/Dis | Pinmux Sel |
|---|---|---|---|---|---|---|---|
| USB0_DRVVBUS | USB0_DRVVBUS | Enable | Down | 0 | Disable | Enable | 0 |
Note that other USB pins do not have pin mux options.