D i d o H a r d w a r e M a n u a l
v . 1 . 0 . 5
Pin name
Conn.
Pin
Function
Notes
EMAC0_PHY_LED_SPEED J2.117 Link Speed LED
Indication.
This pin is driven
active when the
operating speed is
100Mbps. It is
inactive when the
operating speed is
10Mbps or during
line isolation.
ETH_CTTD
J2.127 Tx Center Tap
ETH_CTRD
J2.137 Rx Center Tap
ETH_TX-
J2.129 Transmit Negative
Channel
J2.131 Transmit Positive
Channel
ETH_RX-
J2.135 Receive Negative
Channel
J2.133 Receive Positive
Channel
EMAC_RMREFCLK
J1.91
RMII Reference
Clock
7.5.3
Gigabit EMAC
DIDO provides a Gigabit Ethernet interface connected to
processor EMAC1 controller through GRMII interface. When
required, an external PHY must be mounted on the carrier
board.
The following table describes the interface signals:
Pin name
Conn.
Pin
Function
Notes
EMAC[1]_RGRXC
J1.78
RGMII Receive
Clock
EMAC[1]_RGRXCTL
J1.108 RGMII Receive
Control
EMAC[1]_RGRXD[3]
J1.80
RGMII Receive Data [3:0]
EMAC[1]_RGRXD[2]
J1.86
EMAC[1]_RGRXD[1]
J1.88
August, 2014
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