Motorola ColdFire MCF5281 - Manual (Page 311)

Freescale Semiconductor 17-1
Chapter 17
Fast Ethernet Controller (FEC)
17.1 Introduction
This chapter provides a feature-set overview, a functional block diagram, and transceiver connection
information for the 10 and 100 Mbps MII (media independent interface), as well as the 7-wire serial
interface. Additionally, detailed descriptions of operation and the programming model are included.
NOTE
The MCF5214 and MCF5216 do NOT contain an FEC module.
17.1.1 Overview
The Ethernet media access controller (MAC) supports 10 and 100 Mbps Ethernet/IEEE 802.3 networks.
An external transceiver interface and transceiver function are required to complete the interface to the
media. The FEC supports three different standard MAC-PHY (physical) interfaces for connection to an
external Ethernet transceiver. The FEC supports the 10/100 Mbps MII and the 10 Mbps-only 7-wire
interface.
NOTE
The GPIO module must be configured to enable the peripheral function of
the appropriate pins (refer to
Chapter 26, “General Purpose I/O Module” )
prior to configuring the FEC.
17.1.2 Block Diagram
Figure 17-1 shows the block diagram of the FEC. The FEC is implemented with a combination of
hardware and microcode. The off-chip (Ethernet) interfaces are compliant with industry and IEEE 802.3
standards.
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3