SPRUIU1D July 2020 – December 2024 DRA821U , DRA821U-Q1
Table 4-41 shows configuration pins assignment to functions when boot mode is the PCIe mode.
| BOOTMODE Pins | Field | Value | Description | MCU Only=1 Value |
|---|---|---|---|---|
| 6 | Port | 0 | Reserved | N/A |
| 1 | Port 1 | |||
| 5 | N Lanes | 0 | Reserved | N/A |
| 1 | 1 PCIe lane | |||
| 4 | Clocking | 0 | PHY clock from external pins | N/A |
| 1 | PHY clock from internal source |
Table 4-42 summarizes the PCIe pin configuration done by ROM code for PCIe boot device on port 1.
| Device Pin | Module Signal | Pull Enable | Pull Direction | Driver Index | Rx En/Dis | Tx En/Dis | Pinmux Sel |
|---|---|---|---|---|---|---|---|
| TIMER_IO0 | PCIE1_CLKREQn | Enable | Up | 0 | Disable | Enable | 9 |
Note that PCIe SerDes pins do not have pin mux options.