B.2 DIMM Isolation Procedure
Use the following procedure to isolate a failing DIMM.
1. Find the failing array by using the failing address and the Array Address Registers. Use
the AAR base address and size to create an Address range for comparing the failing
address.
2. Determine if the Address XORing is enabled.
• If Address XORING is enabled, use Table B–2 to find the real array on which two-
way interleaving has failed.
• If Bit 51 of the CSC register is set to 1, XORing is disabled.
Table B–2 Determining the Real Failed Array for 2-Way Interleaving
Failing Address
<8>
Original Array 0 Original Array 2
0 Real Array 0 Real Array 2
1 Real Array 2 Real Array 0
Isolating Failing DIMMs B-3
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