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Service Manual PRELIMINARY
4.3.7
MCHK 620 Correctable Error
The MCHK 620 error is a correctable error detected by the IOD.
The error log in Example 4–1 shows the following:
CPU0 logged the error in a system with two CPUs.
The External Interface Status Register is not valid.
The MC Error Info Registers 0 and 1 captured the error information.
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The commander at the time of the error was CPU0.
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The command at the time of the error was a write-back memory command.
The IOD detected a recoverable error on the system bus. The MC command at the
time of the error is a WriteThru-Mem Command (x00000006). The system bus
commander at the time of the error is CPU0. Since this is a write, the defective FRU
is CPU0.
NOTE: The error log example has been edited to decrease its size; registers of
interest are in bold type. The “MC” bus is the system bus.
Refer to Table 4-9 for information on decoding commands, and refer to Table 4-10
for information on node IDs.
