Freescale Semiconductor MPC5675EVB, User Manual

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MPC5675EVB Users Manual Rev 2.0 July 2010
MPC5675EVB Page 12 of 29
3.7 Ethernet
The EVB is fitted with a National Semiconductor DP8348C Ethernet physical interface (U8) and a
RJ45 connector with integrated activity LED’s and magnetics (J51).
The National Semiconductor DP8348C physical interface is connected to the MII on the MPC5675.
This is a fixed connection with no means of isolation. Pullups are also also present on some of these
signals. These are detailed in the table below. Please be aware of this when using the related GPIOs.
Table 3-11 Pull up/ Pull down resistors for Ethernet Physical
Port Pin Pull Direction Strength
FEC_CRS Down (GND) 2.2k Ω
FEC_RX_ER
Down (GND) 2.2k Ω
FEC_RX_DV
Down (GND) 2.2k Ω
FEC_RXD0
Down (GND) 2.2k Ω
FEC_RXD1 Down (GND) 2.2k
Ω
FEC_RXD2
Down (GND) 2.2k Ω
FEC_RXD3 Down (GND) 2.2k
Ω
FEC_TX_EN Down (GND) 2.2k
Ω
FEC_TXD0 Down (GND) 2.2k Ω
FEC_TXD1 Down (GND) 2.2k Ω
FEC_TXD2 Down (GND) 2.2k Ω
FEC_TXD3 Down (GND) 2.2k Ω
The voltage domain that is used by the GPIO should be set to 3.3v when power is applied to the
physical interface.
Power can be removed from the physical interface via J48.
Table 3-12 Ehternet Physical Interface Power Supply Enabled (J48)
Jumper Position PCB
Legend
Description
J48
(PHY PWR)
FITTED (D)
PHY PWR
The DP4348C Ethernet Physical Interface is powered
from the 3.3v SR.
REMOVED
The DP4348C Ethernet Physical Interface is not
powered