BECKHOFF EtherCAT IP Core for Altera FPGAs v3.0.10 - Manual (Page 47)

IP Core Configuration
Slave Controller – IP Core for Altera FPGAs III-35
5.2.2 Physical Layer tab
Figure 10: Physical Layer tab
Communication Ports
The number of communication ports by default is two. As PHY interface MII/RGMII (1, 2, or 3 ports) or
RMII (1 or 2 ports only) can be selected. It is recommended to use MII as for accuracy of the
distributed clocks is much better with MII.
Optical link (FX) Port
Each port can be configured to be an FX (fiber optic) port which has influence on Enhanced Link
Detection and MI link detection and configuration, since FX connections do not use Auto-negotiation.
Enhanced link detection
Enhanced MII link detection is a mechanism of informing link partners of receive errors.
TX Shift
Automatic or manual TX Shift is available if TX Shift is selected. TX Shift delays MII TX signals to
comply to Ethernet PHY setup and hold timing. Automatic TX Shift uses the TX_CLK signals of the
PHYs to detect appropriate TX Shift settings automatically. Manual TX Shift configuration allows for
delaying the MII TX signals by 0, 10, 20, or 30 ns.