74 SBC330 3U VPX Single Board Computer
Publication No. SBC330-0HH/3
7.4 Power Status LEDs (Blue)
7.5 PCI Express Link Status LEDs (Orange)
The
Port
Good
LEDs
will
light
if
any
link
has
been
made
between
the
two
devices,
even
if
it
is
of
reduced
width
(a
x1
link
on
a
x8
connection
for
example).
The
exact
state
of
each
link
can
only
be
determined
by
software
interrogation
of
the
device
registers.
7.6 SATA Activity LED (Yellow)
7.7 PCIe Fatal Error LED (Red)
Table 7-5 Power Status LEDs
LED
Function
Description
DS206
DS214
Power Good
When lit blue, these LEDs indicate that the associated rail is
at a non-zero voltage.
They do not indicate that the rail is at the correct voltage, nor
that the PSU for that rail has issued its power-good. They
should all be lit during normal operation. The LEDs serve for
rapid fault finding for when PSU rails have failed and normal
electrical investigation may not be possible.
Each LED is driven via a FET switch and cannot be controlled
by software
Table 7-6 PCI Express Link Status LEDs
LED
Function
Description
DS216,
DS217,
DS218,
DS219
On-board and Off-
board PCIe Status
When lit, all on-board PCIe links have initialized and trained
successfully on at least one lane of each PCIe link.
DS216, DS217, DS219 should be lit for normal operation
showing that the on-board PCIe connections are established
DS218 lights if a 4-lane port 1 external PCIe link is trained, i.e.
if the SBC330 has a valid PCIe connection to another board
Table 7-7 SATA Activity LEDs
LED
Function
Description
DS220
SATA Channel 0
Activity
Serial ATA activity - Output from the SATA Si3132 IC.
Normally not lit. Flashes according to disk activity
DS221
SATA Channel 1
Activity
Table 7-8 SATA Activity LEDs
LED
Function
Description
DS222
PEX8518 Switch
PCIe Fatal Error
Lights only if a PCIe fatal error is detected
