Service manual

5-46 AlphaServer 4000/4100 Service Manual
5.4.2 System Bus Nonexistent Address Error
Step 3
Determine which node (if any) should have responded to the command/address
identified in MC_ERR1. Perform the action indicated.
Table 5-5 System Bus Nonexistent Address Error Troubleshooting
MC_ERR1 Data Pattern Most Likely Cause Action
1000 0000 000x xxxx xxxx xxxx 0xxx xxxx Software generated an MC
ADDR > TOP_OF_MEM
reg
Fix software
1000 0000 0000 xxxx xxxx xxxx 1xxx 100x PCI0 bridge did not
respond
Replace IOD0
1000 0000 0000 xxxx xxxx xxxx 1xxx 101x PCI1 bridge did not
respond
Replace IOD0
1000 0000 0000 xxxx xxxx xxxx 1xxx 110x PCI2 bridge did not
respond
Replace IOD1
1000 0000 0000 xxxx xxxx xxxx 1xxx 111x PCI3 bridge did not
respond
Replace IOD1
NOTE: IOD0 = B3040-AA bridge module; IOD1 = B3040-AB bridge module.