PC6-TANGO • CompactPCI
®
PlusIO • Intel® Atom™ E39xx Processor (APL-I SoC)
GP (General Purpose) LED
This programmable bicolour LED can be observed from the PC6-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/pc6/firmware/fwinfo.txt.
HD (Hard Disk Activity) LED
The PC6-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.
As previously described, the green part of this LED may change its function dependent on the state of
the LED PG.
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.
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