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Chapter 3. Fast Ethernet Controller Operation
3-1
PRELIMINARYÑSUBJECT TO CHANGE WITHOUT NOTICE
Chapter 3
Fast Ethernet Controller Operation
30
30
This chapter discusses the operation of the FEC.
3.1 Transceiver Connection
The FEC supports both an MII interface for 10/100 Mbps Ethernet and a seven-wire serial
interface for 10-Mbps Ethernet. The interface mode is selected by
R_CNTRL[MII_MODE], described in Section 6.2.20, ÒReceive Control Register
(R_CNTRL).Ó Table 3-1 shows the 18 MII interface signals that are deÞned by the 802.3
standard.
Serial-mode connections to the external transceiver are shown in Table 3-2.
Table 3-1. MII Signals
Signal Description FEC Signal Name
Transmit clock TX_CLK
Transmit enable TX_EN
Transmit data TXD[3:0]
Transmit error TX_ER
Collision COL
Carrier sense CRS
Receive clock RX_CLK
Receive enable RX_DV
Receive data RXD[3:0]
Receive error RX_ER
Management channel clock MDC
Management channel serial data MDIO
Fr
eescale S
emiconduct
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Freescale Semiconductor, Inc.
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