Beckhoff EtherCAT Technology Section I Instrukcja Użytkownika Pobierz pdf (Strona 41)

Ethernet Physical Layer

Slave Controller – Technology I-21

5.3 MII Interface

Refer to Section III for ESC specific MII information.

If an ESC MII interface is not used, LINK_MII has to be tied to a logic value which indicates no link,

and RX_CLK, RXD, RX_ER, and especially RX_DV have to be tied to GND. The TX outputs can be

left unconnected, unless they are used for ESC configuration.

Table 13: Special/Unused MII Interface signals

Signal

Direction

at PHY

Description

TX_CLK

OUT

ESC20:

TX_CLK of one PHY is used as clock source, TX_CLK of other

PHY is unused, leave open.

ESC dependent (e.g., IP Core):

TX_CLK is optionally used for automatic TX Shift compensation.

Other Beckhoff ESCs:

Unused, leave unconnected.

COL

OUT

Collision detected.

ESC20:

Connected, but not used.

Other Beckhoff ESCs:

Unused. Leave unconnected.

CRS

OUT

Carrier sense.

ESC20:

Connected, but not used.

Other Beckhoff ESCs:

Unused. Leave unconnected

TX_ER

Transmit error.

ESC20:

Connected, always driven low.

Other Beckhoff ESCs:

Connect to GND.

For more details about the MII interface, refer to IEEE Standard 802.3 (Clause 22), available from the

IEEE.

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