SPAU024 April 2025 AM2612
The AM261x controlSOM makes use of two (out of the four) on-die programmable real-time unit and industrial communication subsystems (PRU-ICSS) of the AM261x SoC to interface with up to two Ethernet® ports. When using the AM261x controlSOM with the HSEC180ADAPEVM-AM2, the PR0_PRU0 signals are connected to a Gigabit Ethernet PHY transceiver (DP83869), and the PR0_PRU1 signals are connected to a 48-pin Ethernet Add-on Board Connector. The Ethernet Add-on Board connector allows Ethernet PHY PCBs from the TI Ethernet Add-on Board Ecosystem to be connected to the HSEC180ADAPEVM-AM2 and interfaced with using the AM261x controlSOM. For more information, see the AM261x SOM to HSEC Adapter Board User's Guide.
Signals from the PRU-ICSS PR0 core are connected to SOM HD Connector J3.
| MII Port | AM261x controlSOM Signal | MII Ethernet Mapping |
|---|---|---|
| MII0 | PR0_PRU0_GPIO0 | RXD0 |
| PR0_PRU0_GPIO1 | RXD1 | |
| PR0_PRU0_GPIO2 | RXD2 | |
| PR0_PRU0_GPIO3 | RXD3 | |
| PR0_PRU0_GPIO4 | RX_DV | |
| PR0_PRU0_GPIO5 | RX_ER | |
| PR0_PRU0_GPIO6 | RX_CLK | |
| PR0_PRU0_GPIO8 | RX_LINK | |
| PR0_PRU0_GPIO9 | COL | |
| PR0_PRU0_GPIO10 | CRS | |
| PR0_PRU0_GPIO11 | TXD0 | |
| PR0_PRU0_GPIO12 | TXD1 | |
| PR0_PRU0_GPIO13 | TXD2 | |
| PR0_PRU0_GPIO14 | TXD3 | |
| PR0_PRU0_GPIO15 | TX_EN | |
| PR0_PRU0_GPIO16 | TX_CLK | |
| GPIO73 | INTn | |
| MII0/MII1 | GPIO85 | MDIO0_MDIO |
| GPIO86 | MDIO0_MDC | |
| MII_RST# (IO Expander) | RESET | |
| MII1 | PR0_PRU1_GPIO0 | RXD0 |
| PR0_PRU1_GPIO1 | RXD1 | |
| PR0_PRU1_GPIO2 | RXD2 | |
| PR0_PRU1_GPIO3 | RXD3 | |
| PR0_PRU1_GPIO4 | RX_DV | |
| PR0_PRU1_GPIO5 | RX_ER | |
| PR0_PRU1_GPIO6 | RX_CLK | |
| PR0_PRU1_GPIO8 | RX_LINK | |
| PR0_PRU1_GPIO9 | COL | |
| PR0_PRU1_GPIO10 | CRS | |
| PR0_PRU1_GPIO11 | TXD0 | |
| PR0_PRU1_GPIO12 | TXD1 | |
| PR0_PRU1_GPIO13 | TXD2 | |
| PR0_PRU1_GPIO14 | TXD3 | |
| PR0_PRU1_GPIO15 | TX_EN | |
| PR0_PRU1_GPIO16 | TX_CLK | |
| GPIO119 | INTn |