SC6-TANGO • CompactPC® Serial • Intel® Atom™ E39xx Processor (APL-I SoC)
GP (General Purpose) LED
This programmable bicolour LED can be observed from the SC6-TANGO front panel. The status of
the red part within the LED is controlled by the GPIO16 of the APL-I SoC. Setting GPIO16 to “1"
will switch on the red LED. Turning on or off the green LED is done by setting the bit GPLED in the
board control register CTRLH_REG.
The GP LED is not dedicated to any particular hardware or firmware function with exception of
special power states of the LED PG as described above. Nevertheless, a red blinking GP LED is an
indication that the UEFI/BIOS code couldn't start. While the CPU card is controlled by the
UEFI/BIOS firmware, the GP LED is used to signal board status information during POST (Power On
Self Test). After successful operating system boot, the GP LED may be freely used by customer
software.
For details please refer to www.ekf.com/p/SC6/firmware/fwinfo.txt.
HD (Hard Disk Activity) LED
The SC6-TANGO offers a bicoloured LED marked as HD
1)
placed within the front panel. This LED,
when blinking green, signals activity on any device attached to the SATA ports of the APL-I SoC.
The yellow part of the HD LED shows activity on any of the optional 88SE9170 SATA controller
ports.
1)
The assignment HD was maintained as a synonym for CPU card mass storage - needless to say that most applications
would be equipped with SSD devices instead.
As previously described, the green part of this LED may change its function dependent on the
state of the LED PG.
EB (Ethernet Backplane) LED
To monitor the link status and activity on both Ethernet ports attached to the backplane via the
CompactPCI® serial a single bicoloured LED is provided in the front panel. The states are decoded
as follows:
1_ETH
2_ETH
LED EB
no link
no link
OFF
link
no link
GREEN
no link
link
YELLOW
link
link
GREEN/YELLOW
Blinking of the LED EB in the appropriate colour means that there is activity on the port.
©
EKF
-
30
-
ekf.com
