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Chapter 3
Ethernet External LED
This header provides signals for an external LED that indicates Ethernet links and activity using a single row
of 4 pins with 0.049" (1.25mm) pitch.
Table 3-21. Ethernet External LED Pin Signals (J9)
Pin #
Signal
1
V3.3_CONN
2
ETH_ACT_LED
3
ETH_LINK100_LED
4
ETH_LINK1000_LED Gigabit Ethernet Link
Note: The shaded table cell denotes power.
Miscellaneous
SSD (Solid State Drive)
The CoreModule 720 provides an 8GB SATA SSD, which is soldered directly onto the board. For more
information refer to the SSD data sheet: http://www.greenliant.com/dotAsset/45628.pdf.
Real Time Clock (RTC)
The CoreModule 720 contains a Real Time Clock (RTC). The RTC can be backed up with a battery. If the
battery is not present, the board BIOS has a battery-less boot option to complete the boot process.
Oops! Jumper (BIOS Recovery)
The Oops! jumper function is provided in the event the BIOS settings you have selected prevent you from
booting the system. By using the Oops! jumper you can prevent the current BIOS settings in flash from
being loaded, allowing you to boot using default settings.
Use a jumper to connect the DTR pin (4) to the RI pin (9) on Serial Port 1 (COM0) prior to boot up to
prevent the present BIOS settings from loading. After booting with the Oops! jumper in place, remove the
Oops! jumper and return to BIOS Setup. You must now load factory defaults by selecting Restore Defaults
from the Save & Exit menu. Then select Save Changes and Exit to reboot the system. Now you can modify
the default settings to your desired values. Ensure you save the changes before rebooting the system.
To convert a standard DB9 connector to an Oops! jumper, short together the DTR (4) and RI (9) pins on the
front of the connector as shown in
Standard DB9 Serial
Port Connector (Male)
CoreModule 720
Description
+3 volts – Provides +3 volts to external LED (Pins 1-2 for Green
LED)
Ethernet Activity
Fast Ethernet Link with +3 volts power (Pins 3-4 for Bi-Color
LED)
Figure 3-1
on the Serial Port 1 DB9 connector.
1
2
3
Front View
6
7
Figure 3-1. Oops! Jumper Serial Port (DB9)
Reference Manual
4
5
8
9
Hardware
33
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