2.9.1 Error types

The CCN-502 supports a number of error types.

The supported errors are:

Correctable errors

These are errors that can be corrected using Error Correction Code (ECC) or other methods. They include:

  • An L3 single-bit ECC error.

These errors are handled in the following manner. The system:

  1. Counts the occurrence of these errors.
  2. Masks signaling of the error to the MN.
  3. Triggers error signaling to the MN using a threshold count.
Uncorrectable fatal errors

These are errors in the control logic at a node, where continuing operation might corrupt the system beyond recovery. They include:

  • Double-bit ECC error in data being read from the L3 cache or snoop filter.
  • A packet received with error in the target ID.
  • An internal logic error.

These errors are handled in the following manner. The system:

  1. Logs the error.
  2. Sends an error signal to the MN.
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