Datasheet

Table Of Contents
24. GMAC - Ethernet MAC
The description and registers of this peripheral are using the 'GMAC' designation although the device
does not support Gigabit Ethernet functionality.
24.1 Description
The Ethernet Media Access Controller (GMAC) module implements a 10/100 Mbps Ethernet MAC,
compatible with the IEEE 802.3 standard. The GMAC can operate in either half or full duplex mode at all
supported speeds.
24.2 Features
Compatible with IEEE Standard 802.3
10, 100 Mbps operation
Full and half duplex operation at all supported speeds of operation
Statistics Counter Registers for RMON/MIB
MII/RMII interface to the physical layer
Integrated physical coding
Direct memory access (DMA) interface to external memory
Programmable burst length and endianism for DMA
Interrupt generation to signal receive and transmit completion, errors or other events
Automatic pad and cyclic redundancy check (CRC) generation on transmitted frames
Automatic discard of frames received with errors
Receive and transmit IP, TCP and UDP checksum offload. Both IPv4 and IPv6 packet types
supported
Address checking logic for four specific 48-bit addresses, four type IDs, promiscuous mode, hash
matching of unicast and multicast destination addresses and Wake-on-LAN
Management Data Input/Output (MDIO) interface for physical layer management
Support for jumbo frames up to 10240 Bytes
Full duplex flow control with recognition of incoming pause frames and hardware generation of
transmitted pause frames
Half duplex flow control by forcing collisions on incoming frames
Support for 802.1Q VLAN tagging with recognition of incoming VLAN and priority tagged frames
Programmable Inter Packet Gap (IPG) Stretch
Recognition of IEEE 1588 PTP frames
IEEE 1588 time stamp unit (TSU) and TSU event generation
Support for 802.1AS timing and synchronization
Supports 802.1Qav traffic shaping on two highest priority queues
Support for 802.3az Energy Efficient Ethernet
SAM D5x/E5x Family Data Sheet
GMAC - Ethernet MAC
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 477