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Functional Description
17.4.5 Network Interface Options
The FEC supports both an MII interface for 10/100 Mbps Ethernet and a 7-wire serial
interface for 10 Mbps Ethernet. The interface mode is selected by the RCR[MII_MODE]
bit. In MII mode (RCR[MII_MODE] = 1), there are 18 signals defined by the IEEE 802.3
standard and supported by the EMAC. These signals are shown in Table 17-5 below.
The 7-wire serial mode interface (RCR[MII_MODE] = 0) operates in what is generally
referred to as the "AMD" mode. 7-wire mode connections to the external transceiver are
shown in Table 17-6.
17-8
Table 17-5. MII Mode
Signal Description
Transmit Clock
Transmit Enable
Transmit Data
Transmit Error
Collision
Carrier Sense
Receive Clock
Receive Data Valid
Receive Data
Receive Error
Management Data Clock
Management Data
Input/Output
Table 17-6. 7-Wire Mode Configuration
SIGNAL DESCRIPTION
Transmit Clock
Transmit Enable
Transmit Data
Collision
Receive Clock
Receive Data Valid
Receive Data
MCF5282 User's Manual
EMAC pin
ETXCLK
ETXEN
ETXD[3:0]
ETXER
ECOL
ECRS
ERXCLK
ERXDV
ERXD[3:0]
ERXER
EMDC
EMDIO
EMAC PIN
ETXCLK
ETXEN
ETXD[0]
ECOL
ERXCLK
ERXDV
ERXD[0]
MOTOROLA
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