Information For Isolating Failures; Information Needed To Isolate Failing Dimms - Compaq AlphaServer ES45 Service Manual

E.1

Information for Isolating Failures

Table E–1 lists the information needed to isolate the failure.
Appendix D for the register table for the Array Address Registers
(AARs). The failing address and failing data can come from a variety of
different locations such as the SROM serial line, SRM screen displays,
the SRM event log, and errors detected by the 21264 (EV68) chip.
Convert the address to data bits if the address is not on a 256-bit alignment
(address ends in a value less than 20 or address xxxxx20 or address xxxxxnn,
where nn is 1 through 1F). For example, using failing address 0x1004 and
failing data bit 8(dec), first multiply the failing address 4 by 8 = 32. Then add
32 to the failing data bit to yield the actual failing data bit 40. This conversion
yields the new failing information to be failing address 0x1000 and failing data
bit = 40(dec).
Table E–1 Information Needed to Isolate Failing DIMMs
Failing Address
Failing Data/Check bits
Array Address Registers
CSC
AAR0
AAR1
AAR2
AAR3
DPR Locations
DPR:80
DPR:82
DPR:84
DPR:86
E-2 ES45 Service Guide
Memory Addresses
801.A000.0000
801.A000.0100
801.A000.0140
801.A000.0180
801.A000.01C0
Memory Addresses
801.1000.2000
801.1000.2080
801.1000.2100
801.1000.2180
See