Fault Detection And Reporting; Table 6-10 Compaq Es40Cslp Fault Detection And Correction - Compaq ES40CSLP Installation, User & Service Manual

Troubleshooting and Diagnostics

6.7.3 Fault Detection and Reporting

Table 6-10 provides a summary of the fault detection and correction components of Compaq
ES40CSLP systems.
Generally, PALcode handles exceptions as follows:
1. The PALcode determines the cause of the exception.
2. If possible, it corrects the problem and passes control to the operating system for reporting
before returning the system to normal operation.
If PALcode is unable to correct the problem, it
–
–
–
3. If error/event logging is required, control is passed through the system control block (SCB)
to the appropriate operating system exception handler. The operating system exception
handler logs the error condition into the binary error log. If the error is not an uncorrectable
CPU error or system error, Compaq Analyze should diagnose the error to the defective
FRU.

Table 6-10 Compaq ES40CSLP Fault Detection and Correction

Component
Alpha 21264 microprocessor
Backup cache (B-cache)
Memory DIMMs
PCI SCSI controller adapter
ISA-to-PCI bridge chip
6–52 Compaq ES40CSLP Rackmount System Installation/User/Service Guide
Logs double error halts into the flash ROM
Logs uncorrectable errors to the shared RAM
For single halts, logs the uncorrectable logout frame into shared RAM.
Fault Detection/Correction Capability
Contains error checking and correction (ECC) logic for
data cycles. Check bits are 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).
ECC check bits on the data store, and parity on the tag
address store and tag control store.
ECC 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.