Compaq AlphaServer ES45 Service Manual page 423

4. Use the following table to determine the proper set. Bits<27,28,29,30,31,32>
are from the failing address.
Array Configuration Type Bits <7:4> from DPR
Size
4 & 5
256MB Lower Set
512MB Lower Set
1GB Lower Set
2GB Lower Set
4GB Lower Set
8GB Lower Set
5. Now that you have the real array, the failing Data/Check bits, and the
correct set, use Table E–5 to find the failing DIMM or DIMMs.
The table shows data bits 0–255 and check bits 0–31. These data bits indicate a
single-bit error. An SROM compare error would yield address and data bits
from 0–63. When you convert the address to be in the correct range, the failing
data would be somewhere between 0 and 255.
9
Upper Set Bit <27> == 0 – Lower Set, 1– Upper Set
Upper Set Bit <28> == 0 – Lower Set, 1– Upper Set
Upper Set Bit <29> == 0 – Lower Set, 1– Upper Set
Upper Set Bit <30> == 0 – Lower Set, 1– Upper Set
Upper Set Bit <31> == 0 – Lower Set, 1– Upper Set
Upper Set Bit <32> == 0 – Lower Set, 1– Upper Set
D & F
Isolating Failing DIMMs E-5