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Chapter 6
Ethernet MAC Controller
The on-board Ethernet Media Access Controller (EMAC) is compatible with IEEE 802.3,
and has passed the University of New Hampshire (UNH) testing. It supports both 10- and
100-Mbit/s transfer rates, and full and half duplex operation. Other features include:
• Transmit and receive FIFOs
• Media Independent Interface (MII) to the physical layer
• Physical layer management through Management Data I/O (MDIO) interface
• Support for:
– half-duplex flow control by forcing collisions on incoming frames
– full-duplex flow control with recognition of incoming pause frames and hardware
generation of transmitted pause frames
– 802.Q VLAN tagging with recognition of incoming VLAN and priority tagged frames
– multiple buffers per receive and transmit frame
• APB interface
• AHB bus master DMA interface to external system memory
• Interrupt generation for receive and transmit completion
• Statistics counter registers for Remote Monitoring (RMON) and Management
Information Base (MIB)
• Automatic pad and CRC generation on transmitted frames
• Automatic discarding of frames received with errors
• Address checking logic supports up to four specific (hardware) 48-bit addresses
• Promiscuous mode support where all valid received frames are copied to memory
• Hash matching of unicast and multicast destination addresses
• Serial network interface operation
• Software programmable MAC address
• Jumbo frames of up to 10,240 bytes supported.
Version 1.0
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