Beckhoff EtherCAT IP Core for Xilinx FPGAs v2.04e Manuale Utente Scaricare il pdf (Pagina 78)

Ethernet Interface

III-66 Slave Controller – IP Core for Xilinx FPGAs

9 Ethernet Interface

The IP Core is connected with Ethernet PHYs using MII or RMII interfaces. MII is recommended since

the PHY delay (and delay jitter) is smaller in comparison to RMII.

9.1 PHY Management interface

9.1.1 PHY Management Interface Signals

The PHY management interface of the IP Core has the following signals:

EtherCAT

device

MCLK

MDIO

PHY_OFFSET_VEC[4:0]

Figure 26: PHY management Interface signals

Table 33: PHY management Interface signals

Signal

Direction

Description

MCLK

OUT

Management Interface clock (alias MCLK)

MDIO

BIDIR

Management Interface data (alias MDIO)

PHY_OFFSET_VEC[4:0]

INPUT

PHY address offset (consecutive PHY addresses,

address of port 0)

MDIO must have a pull-up resistor (4.7 kΩ recommended for ESCs), either integrated into the ESC or

externally. MCLK is driven rail-to-rail, idle value is High.

9.1.2 PHY Address Configuration

The EtherCAT IP Core addresses Ethernet PHYs typically using logical port number plus PHY

address offset. Ideally, the Ethernet PHY addresses should correspond with the logical port number,

so PHY addresses 0-2 are used.

A PHY address offset of 0-31 can be applied which moves the PHY addresses to any consecutive

address range. The IP Core expects logical port 0 to have PHY address 0 plus PHY address offset

(and so on).

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Beckhoff EtherCAT IP Core for Xilinx FPGAs v2.04e Manuale Utente Pagina 78