Dual DP83640 Ethernet PHY HSMC Daughter Board
Reference Guide
V1.0 - October 2013
8
3.2.1 LEDs
The RJ45 connector provides a green and orange LED on its front side individual per port.
Table 1: RJ45 LEDs
LED
Description
green (l)
LED_LINK from PHY: Lit when link up
orange (r)
LED_SPEED from PHY: On in 100Mbps mode, Off in
10Mbps mode.
Note
:
The PHY powers up in Mode 1 for the LEDs (see strap options). That is, the LEDs are showing
the above information. Line activity is not visible in this mode as there is no separate activity LED. It
is possible to configure the PHY to operate the LEDs in Mode 2 by writing into MDIO register 0x19
clearing bits 5,6. In this mode, the link led will be on when the link is established and then blink on
activity.
3.2.2 PHY Generic I/O (GPIO), J2, J3
Each PHY provides several general-purpose I/O pins for event generation and event capture.
Four of these (gpio1-4) are available on a 5x2 connector on the daughter board per
PHY device.
In addition, the gpio4 is also available at the HSMC connector.
Gpio8 of the PHY is wired to HSMC only.
clk_out of the PHY is wired to HSMC and to the connector
1
3
5
7
9
2
4
6
8
10
(5x2)
GND
gpio1
GND
GND
GND
gpio2
gpio3
gpio4
to HSMC
to PHY 1/2
gpio8
clk_out
GND
Figure 4: GPIO Connector (J2, J3)
