ATSAMV71Q21 has a built in 10/100Mbps Ethernet IEEE® 802.3 compatible MAC with RMII and MII interface. The MAC also supports energy efficient Ethernet (IEEE 802.3az) and Ethernet Audio Video Bridging (AVB) including IEEE 802.1AS and IEEE802.1Qav. SAM V71 Xplained Ultra connects the MAC to a Micrel KSZ8061RNBVA RMII physical-layer transceiver (PHY), with IEEE 802.3az support, which is connected to one RJ45 Ethernet connector.
A unique EUI-48 address is available on every SAM V71 Xplained Ultra through the on-board AT24MAC402, the EUI-48 address can be used as a MAC address for the KSZ8061RNBVA. The address is also programmed into the on board EDBG. For more information, see Kit Specific Data.
Table 1 lists all pins connected from the ATSAMV71Q21 to the Ethernet PHY.
| SAM V71 pin | Function | Ethernet function | Shared functionality |
|---|---|---|---|
| PD00 | GTXCK | REF_CLK | Shield |
| PD01 | GTXEN | TXEN | |
| PD02 | GTX0 | TXD0 | |
| PD03 | GTX1 | TXD1 | |
| PD04 | GRXDV | CRS_DV | Trace |
| PD05 | GRX0 | RXD0 | Trace |
| PD06 | GRX1 | RXD1 | Trace |
| PD07 | GRXER | RXER | Trace |
| PD08 | GMDC | MDC | Trace |
| PD09 | GMDIO | MDIO | |
| PA19 | GPIO | INTERRUPT | EXT1, Shield |
| PA29 | GPIO | SIGDET | |
| PC10 | GPIO | RESET |
The KSZ8061RNBVA also has a set of parameters that are latched in during reset based on I/O pin levels, these configuration options have a default mode on the kit done by external pull-up and pull-down resistors. For detailed information about the configuration see the KSZ8061RNBVA datasheet.
| Configuration name | Default value on kit | Default configuration |
|---|---|---|
| PHYAD | 001 | The PHYs address is 001 |
| CONFIG | 111 | RMII mode with MDI/MDI-X enabled |
| AUTONEG | 0 | Auto negotiation of link speed enabled |
| NAND_TREE | 1 | NAND TREE test mode disabled |
| QWF | 0 | Quiet-WIRE filtering enabled |