Information

Enhanced Three-Speed Ethernet Controllers
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
16-172 Freescale Semiconductor
16.7.1 Interface Mode Configuration
This section describes how to configure the eTSEC in different supported interface modes. These include
the following:
•MII
•RGMII
The pinout, the data registers that must be initialized, as well as speed selection options are described.
16.7.1.1 MII Interface Mode
Table 16-149 describes the signal configurations required for MII interface mode.
Table 16-149. MII Interface Mode Signal Configuration
eTSEC Signals MII Interface
Frequency 25 [MHz]
Voltage 3.3 [V]
Signals I/O No. of Signals Signals I/O No. of Signals
GTX_CLK O 1 leave unconnected
TX_CLK I 1 TX_CLK
I1
TxD[0] O 1 TxD[0] O 1
TxD[1] O 1 TxD[1] O 1
TxD[2] O 1 TxD[2] O 1
TxD[3] O 1 TxD[3] O 1
TX_EN O 1 TX_EN O 1
TX_ER O 1 TX_ER
O1
RX_CLK I 1 RX_CLK I 1
RxD[0] I 1 RxD[0] I 1
RxD[1] I 1 RxD[1] I 1
RxD[2] I 1 RxD[2] I 1
RxD[3] I 1 RxD[3] I 1
RX_DV I 1 RX_DV I 1
RX_ER I 1 RX_ER I 1
COL I 1 COL I 1
CRS I 1 CRS I 1
Sum 17 Sum 16