5.3.7 Ethernet

ATSAME54P20A has a built-in 10/100Mbps Ethernet IEEE® 802.3 compatible MAC with RMII interface. The MAC also supports energy efficient Ethernet (IEEE 802.3az). SAM E54 Xplained Pro connects the MAC to a Micrel KSZ8091RNACA 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 E54 Xplained Pro through the onboard AT24MAC402, the EUI-48 address can be used as a MAC address for the KSZ8091RNACA. The address is also programmed into the onboard EDBG. For more information, see Kit Specific Data.

The table below lists all pins connected from the ATSAME54P20A to the Ethernet PHY.

Info: Several of the Ethernet signals are shared with the PCC connector. This means that there is no Ethernet support if PCC is used in an application.
Table 5-18. KSZ8061RNBW Connections
SAM E54 pinFunctionEthernet functionShared functionality
PA14GTXCKREF_CLKPCC
PA17GTXENTXENPCC
PA18GTX0TXD0PCC
PA19GTX1TXD1PCC
PC20GRXDVCRS_DV
PA13GRX0RXD0PCC
PA12GRX1RXD1PCC
PA15GRXERRXERPCC
PC11GMDCMDCPCC
PC12GMDIOMDIOPCC
PD12GPIOINTERRUPT
PC21GPIORESET

The KSZ8091RNACA 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 KSZ8091RNACA datasheet.

Table 5-19. KSZ8091RNACA Kit Configuration
Configuration nameDefault value on kitDefault configuration
PHYAD00The PHYs address is 00000
PME_EN0Disable PME Enable output for Wake-On-LAN
ANEN_SPEED1Auto negotiation enabled and 100Mbps link speed enabled