Datasheet

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Signal Name Function MII RMII
GMDC Management Data Clock MDC MDC
GMDIO Management Data Input/Output MDIO MDIO
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24.5 Product Dependencies
24.5.1 I/O Lines
Using the GMAC I/O lines requires the I/O pins to be configured using the port configuration (PORT).
Related Links
6. I/O Multiplexing and Considerations
32. PORT - I/O Pin Controller
24.5.2 Power Management
The GMAC continues to operate in IDLE and Standby sleep modes if REF_CLK or GRXCK is running.
All GMAC interrupts can be used to wake up the device from IDLE sleep mode.
In Standby sleep mode, only the WOL interrupt can wake up the CPU, and the corresponding ISR flags
will not be set.
Related Links
18. PM – Power Manager
24.5.3 Clocks
The GMAC peripheral relies on a system clock from the Main Clock Controller (MCLK) for register access
and GMAC MCK.
In MII mode, the actual Transmit or Reference Clock (GTXCK) and Receive Clock (GRXCK) are external
signals.
In RMII mode, the actual Reference Clock (REF_CLK) are external signals.
The respective pins are configured in the PORT peripheral.
Related Links
6. I/O Multiplexing and Considerations
32. PORT - I/O Pin Controller
24.5.4 Interrupt Sources
The GMAC interrupt line is connected to the interrupt controller. Using the GMAC interrupt requires to
configure the interrupt controller first.
Related Links
10.2 Nested Vector Interrupt Controller
24.5.5 Events
The event GMAC Timestamp Comparison is connected to the Event System.
Related Links
SAM D5x/E5x Family Data Sheet
GMAC - Ethernet MAC
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 479