4.3.7 Ethernet

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 4-26 lists all pins connected from the ATSAMV71Q21 to the Ethernet PHY.

Info: Several of the Ethernet signals are shared with the trace connector, this means that there is no Ethernet support if trace is used in an application.
Table 4-26. KSZ8061RNBVA Connections
SAM V71 pinFunctionEthernet functionShared functionality
PD00GTXCKREF_CLKShield
PD01GTXENTXEN
PD02GTX0TXD0
PD03GTX1TXD1
PD04GRXDVCRS_DVTrace
PD05GRX0RXD0Trace
PD06GRX1RXD1Trace
PD07GRXERRXERTrace
PD08GMDCMDCTrace
PD09GMDIOMDIO
PA19GPIOINTERRUPTEXT1, Shield
PA29GPIOSIGDET
PC10GPIORESET

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.

Table 4-27. KSZ8061RNBVA kit configuration
Configuration nameDefault value on kitDefault configuration
PHYAD001The PHYs address is 001
CONFIG111RMII mode with MDI/MDI-X enabled
AUTONEG0Auto negotiation of link speed enabled
NAND_TREE1NAND TREE test mode disabled
QWF0Quiet-WIRE filtering enabled