D-4
Motherboard
Pinout
Data
Table D-2. Motherboard Signal Definitions
Signal
Definition
(KEY)
Keyed hole
in
connector plug.
-12
- 12 volt supply.
-19
-
19
volt supply.
-2
- 2 volt supply for processor stack back gate.
12
12 volt supply.
12MM 12 volt supply to mass storage devices only.
16
16
volt bias supply voltage.
16G
Ground for bias supply.
19 19 volt supply.
3.85
3.85
volt supply.
5 5 volt supply.
5G
5 volt supply ground.
6.2 6.2 volt supply.
CS-12
Control sense for - 12 volt supply.
CS-2
Control sense for - 2 volt supply.
CS-2G
Control sense for - 2 volt supply ground.
CS12
Control sense for 12 volt supply.
CS3.85
Control sense for
3.85
volt supply.
CS5
Control sense for 5 volt supply.
CS5G
Control sense for 5 volt supply ground.
CS6.2 Control sense for 6.2 volt supply.
DGND Dirty ground return.
FANCTL Fan control. Connected to PST.
FANF
Power to processor stack fan (negative voltage).
FANGND
Fan ground return.
FANI
Power to
110
card cage fan (negative voltage).
FANP
Power to power supply fan (negative voltage).
GND
Ground plane of motherboard.
GUARDGND Shields power supply supervisor board from primary
and
secondary boards.
LOLINE Low line indication.
MS-12
Monitor sense for
-12
volt under/over voltage.
MS-19
Monitor sense for - 19 volt under/over voltage.
MS-2
Monitor sense for - 2 volt under/over voltage.
MS12
Monitor sense for 12 volt under/over voltage.
MS19 Monitor sense for 19 volt under/over voltage.
MS3.85 Monitor sense for
3.85
volt under/over voltage.
MS5 Monitor sense for 5 volt under/over voltage.
MS6.2 Monitor sense for 6.2 volt under/over voltage.
MSG
Monitor sense ground.
N-2UNDER
- 2 volt undervoltage (negative true).
NBR
I/O bus burst mode
DMA
request (negative true).
NDEND
110
bus device
end
(negative true).
NDO Door
open
(negative true). Wired OR of NFDO
and
NIDO.
NDOORLED Door
open
(negative true).
NFANHI
Power supply fan at highest speed (negative true).
NFDO
Processor stack door
open
(negative true).
OR'd
with NIDO.
NFLG
I/O
bus ready for data (negative true).
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