EKF PC7-FESTIVAL, User Manual

Page: 47 / 108

User Guide • PC7-FESTIVAL • CompactPCI® PlusIO CPU Board
HD (Hard Disk Activity) LED
The PC7-FESTIVAL offers a bicoloured LED marked as HD placed within the front panel. This LED,
when blinking green, signals activity on any device attached to the SATA ports of the CM238.
As previously described, the green part of this LED may change its function dependent on the
state of the LED PG.
OT (Processor Hot) LED
The thermal status of the processor can be monitored exactly by several utilities that are available
in the market (e.g. “Speedfan” for Windows® or “lmsensors” for Linux). The LED “OT” (over-
temperature) can be assumed as a summery of that. It shows when the processor impends to get
too hot, resulting in reducing its performance by Intel® Speed Step® or similar.
Power Supply Status (PWR_FAIL#)
Power supply failures may be detected before the system crashes down by monitoring the signals
DEG# or FAL#. These active low lines are additions to the CompactPCI® specification and may
bedriven by the power supply. DEG# signals the degrading of the supply voltages, FAL# there
possiblefailure. On the PC7-FESTIVAL DEG# is pulled to VCC and FAL# is routed to GPP_D0 of the
CM238 PCH.
As an option a circuit can be stuffed on PC7-FESTIVAL to use this signal as an output to drive
PSON# of a power supply. With this option and the related external wiring it is possible to switch
off the mainpower supply when the system powers down to state S4. To restart the system, the
PSON# line mustbe pulled down manually for a second approximately, e.g. by an external
push-button.
The use of this signal as PWR_FAIL# or PSON# is mutually exclusive.
© EKF - 47 - ekf.com