MPC857T Freescale Semiconductor, Inc, MPC857T Datasheet - Page 69

• Manufacturer Part Number: MPC857T
• Description: Mpc857t Powerquicc Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

Figure 71
Figure 72
13 FEC Electrical Characteristics
This section provides the AC electrical specifications for the Fast Ethernet controller (FEC). Note that the
timing specifications for the MII signals are independent of system clock frequency (part speed
designation). Furthermore, MII signals use TTL signal levels compatible with devices operating at either
5.0 or 3.3 V.
Freescale Semiconductor
UtpClk
PHREQn
RxClav
RxEnb
UTPB
SOC
UtpClk
PHSELn
TxClav
TxEnb
UTPB
SOC
shows signal timings during UTOPIA receive operations.
shows signal timings during UTOPIA transmit operations.
MPC862/857T/857DSL PowerQUICC™ Family Hardware Specifications, Rev. 3
U5
U5
HighZ at MPHY
5
HighZ at MPHY
Figure 72. UTOPIA Transmit Timing
Figure 71. UTOPIA Receive Timing
U2
U2
2
2
U5
5
U3
U3
U1
3
U1
3
1
U4
U4
4
4
U1
U1
U3
3
FEC Electrical Characteristics
HighZ at MPHY
HighZ at MPHY
U4
4
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