Fault Detection And Reporting; Table 5-1 Digital Server 3300/3300R Fault Detection And Correction - Digital Equipment 3300R Service Manual

Error Log Analysis

Fault Detection and Reporting

Table 5-1 provides a summary of the fault detection and correction components of
Server 3300/3300R systems.
DIGITAL
Generally, PALcode handles exceptions as follows:
•
The PALcode determines the cause of the exception.
•
If possible, it corrects the problem and passes control to the operating system for
reporting before returning the system to normal operation.
•
If error/event logging is required, control is passed through the system control block
(SCB) to the appropriate exception handler.

Table 5-1 DIGITAL Server 3300/3300R Fault Detection and Correction

Component
CPU Daughter Board
Alpha 21164 microprocessor
Backup cache (B-cache)
Memory Subsystem
Memory DIMMs
Motherboard
SCSI controller
EISA-to-PCI bridge chip
5–2 DIGITAL Server 3300/3300R
Fault Detection/Correction Capability
Contains error detection and correction (EDC) logic
for data cycles. There are check bits associated with
all data entering and exiting the microprocessor.
A single-bit error on any of the four longwords being
read can be corrected (per cycle). A double-bit error
on any of the four longwords being read can be
detected (per cycle).
EDC check bits on the data store, and parity on the
tag address store and tag control store.
EDC logic protects data by detecting and correcting
data cycle errors. A single-bit error on any of the
four longwords can be corrected (per cycle). A
double-bit error on any of the four longwords being
read can be detected (per cycle).
SCSI data parity is generated.
PCI data parity is generated.