Compaq AlphaServer ES40, Service Manual

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Registers D-37
D.15 DPR Registers for 680 Correctable Machine
Check Logout Frames
DPR Locations A0:A9 represent the information that the console will
read when a 680 machine check logout frame is loaded. They provide
the interrupt information obtained by the RMC through the LM78
sensors. When an error occurs, the RMC writes the bits and delivers an
IRQ to the SRM console. The SRM reads the bits and clears them. On
the next 680 error, the RMC writes the error into the A0:A9 locations.
Table D–14 DPR Locations A0:A9
DPR
Location
Description
A0 If bit is set the associated fault is active.
Bit 0 +3.3v out of tolerance
1 +5 v out of tolerance
2 +12 v out of tolerance
3 Vterm out of tolerance
4 PCI backplane Zone 0 temp sensor is over temp
5 BTI (overtemp signals from all CPU and LM78 sensors)
6 Fan 1 fault (below the minimum RPM)
7 Fan 2 fault (below the minimum RPM)
A1 Bit 0 CTERM out of tolerance
2 –12 v out of tolerance
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