Compaq AlphaServer ES40, Service Manual

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Registers D-41
D.17 DPR 680 Fatal Registers
The RMC is powered by an auxiliary 5V supply that is independent
from the system power subsystem. When any catastrophic failures
(such as overtemperature failure) occur, this error state is captured as
shown in Table D–16. The information is used to populate the console
data log uncorrectable error frame in Environ_QW_8.
Table D–16 DPR 680 Fatal Registers
DPR
Location
Definition
BD Copy of the power supply AC input value
Bit 0
PS0 1 indicates AC input is valid; 0 indicates invalid
Bit 1 PS1
Bit 2 PS2
BE Snapshot of the fault I/O expander, which indicates PS, VTERM,
CPU regulator fault if bit is set.
Bit 0
PS0
Bit 1 PS1
Bit 2 PS2
Bit 3 VTERM
Bit 4 CPU0
Bit 5 CPU1
Bit 6 CPU2
Bit 7 CPU3
BF RMC shutdown code
Bit 0
Unused
Bit 1 No CPU in CPU slot 0
Bit 2 Invalid CPU SROM voltage setting or checksum
Bit 3 TIG load initialization or sequence fail
Bit 4 Overtemperature failure
Bit 5 CPU door open
Bit 6 CPU fans 5 and 6 failed
Bit 7 CTERM failure