Compaq AlphaServer ES40 User Manual

5-14 Compaq AlphaServer ES40 Service Guide
5.3 Machine Checks/Interrupts
The exceptions that result from hardware system errors are called
machine checks/interrupts. They occur when a system error is detected
during the processing of a data request.
During the error-handling process, errors are first handled by the appropriate
PALcode error routine and then by the associated operating system error
handler. PALcode transfers control to the operating system through the PAL
handler.
Table 5–2 lists the machine checks/interrupts that are related to error events.
The designations — 630, 670, 620, 660, and 680 — indicate a system control
block (SCB) offset to the fatal system error handler for Tru64 UNIX and
OpenVMS. Windows NT does not use SCB offsets, but instead uses a self-
maintained interrupt dispatch table (IDT).
Table 5–2 Machine Checks/Interrupts
Error Type Error Descriptions
CPU Correctable Error (630)
Generic Alpha 21264 (EV6)
correctable errors.
B-cache probe hit single-bit ECC error
D-cache tag parity error on issue
I-cache tag or data parity error
D-cache victim single-bit ECC error
B-cache single-bit ECC fill error to I-stream or
D-stream
Memory single-bit ECC fill error to I-stream
or D-stream
CPU Uncorrectable Error
(670)
Fatal microprocessor machine
check errors that result in a
system crash.
PAL detected bugcheck error
Operating system detected bugcheck error
EV6 detected second D-cache store EEC error
EV6 detected D-cache tag parity error in
pipeline 0 or 1
EV6 detected duplicate D-cache tag parity
error
EV6 detected double-bit ECC memory fill
error
EV6 detected double-bit probe hit EEC error
EV6 detected B-cache tag parity error

Compaq AlphaServer ES40 Specifications

General

Brand	Compaq
Model	AlphaServer ES40
Category	Server
Language	English