AVR32768
Signal name Recommended pin connection
Description
RX_ER
RX_CLK
TX_EN
TXD[0:3]
TX_ER
Receive error
Receive clock, 25MHz for 100Mb/s data rate
Transmit enable
Transmit data 4-bit
Transmit error
10.2 Ethernet interface in RMII mode
Figure 10-2. Ethernet interface in RMII mode example schematic.
TX_CLK/REF_CLK
CRS
COL
Ethernet
X1
PHY
MDIO
MDIO
MDC
MDC
CRS
RX[0:1]
RX_ER
TX_EN
TX[0:1]
RX_DV
RXD[0:3]
RX_ER
RX_CLK
TX_EN
TXD[0:3]
TX_ER
Table 10-2. Ethernet interface in RMII mode checklist.
Signal name Recommended pin connection
Description
TX_CLK/
REF_CLK
Reference clock, 50MHz for 100Mb/s data rate
CRS
Not used in RMII mode
Not used in RMII mode
COL
MDIO
MDC
RX_DV
PHY maintenance data
PHY maintenance clock
Carrier sense, data valid
17
32157A-AVR-12/10
ATMEL [ ATMEL ]
