System information

3-12
AlphaServer 800 Service Guide
To determine the failing DIMM, match the lowest five bits of the failing address in
which the bad data is received to the failing DIMM using the table below.
Failing Address Lowest
Five Bits Failing DIMM
00
81
10 2
18 3
In the example, the lowest five bits (represented by the last or rightmost character in
the address) in the failing address is 8 (a11848). Therefore, the failing DIMM is
DIMM 1.
Figure 3-1 AlphaServer 800 Memory Layout
DIMM 3
DIMM 2
DIMM 1
Bank 1
Bank 0
IP00071A
DIMM 0
DIMM 3
DIMM 2
DIMM 1
DIMM 0