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User Guide • SC2-PRESTO • CompactPCI
EB (Ethernet Backplane) LED
To monitor the link status and activity on both Ethernet ports attached to the backplane via the
®
CompactPCI
Serial connector P6 a single bicoloured LED is provided in the front panel. The states are
decoded as follows:
Blinking of the LED EB in the appropriate colour means that there is activity on the port.
Main Power Supply Control (PS_ON#)
The SC2-PRESTO draws its power from the +12V main supply rail defined by the CompactPCI
specification. The board has been designed to control this main power supply by use of the signal
PS_ON# (connector P1 pin E2). If the system enters the sleep state S5 (soft off), the signal PS_ON#
is pulled high, hence the main power supply is switched-off. The SC2-PRESTO is held in soft off state
until a power management event (e.g. power button event triggered by the front panel handle) brings
back the system to the S0 state.
In order to work as described above and to generate clean signals on PS_ON#, the stand-by voltage
+5VSTB is necessary. This optional power rail, tied to connector P1 pin B1, is also part of the
®
CompactPCI
Serial specification. The stand-by power rail must be switched-on "always", independent
of the state of PS_ON#.
Nevertheless, +5VSTB is not mandatory to operate the SC2-PRESTO. If no stand-by power is available,
the board creates this voltage from the main power rail. In this case it is important that the PS_ON#
signal is pulled down somewhere in the system.
Power Supply Status (PWR_FAIL#)
Power supply failures may be detected before the system crashes down by monitoring the signal
PWR_FAIL#. This active low line (connector P1 pin F3) is an addition to the CompactPCI
specification and may be driven by the power supply. PWR_FAIL# signals the possible failure of the
main supply voltage +12V. On the SC2-PRESTO the signal PWR_FAIL# is routed to GPIO4 of the
QM87 PCH to analyse the state of the power supply unit.
© EKF
®
Serial CPU Board • Intel® Core
1_ETH
2_ETH
no link
no link
link
no link
no link
link
link
link
-30-
TM
LED EB
OFF
GREEN
YELLOW
GREEN/YELLOW
4xxx Processor
®
Serial
®
Serial
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