16

AVR32768

32157A-AVR-12/10

10 Ethernet interface

When designing in the Ethernet physical device (PHY), the designer should refer to

the datasheet for the PHY. This datasheet usually contains layout advice, connection

schematics, reference design, etc.

The information in the PHY datasheet is mandatory to get optimal performance and

stability.

10.1 Ethernet interface in MII mode

Figure 10-1.

Ethernet interface in MII mode example schematic.

Table 10-1.

Ethernet interface in MII mode checklist.

Signal name

Recommended pin connection

Description

TX_CLK/

REF_CLK

Transmit clock, 25MHz for 100Mb/s data rate

CRS

Carrier sense

COL

Collision detect

MDIO

PHY maintenance data

MDC

PHY maintenance clock

RX_DV

Receive data valid

RXD[0:3]

Receive data 4-bit