ErrorMaskRegister

The errorMask is used to mask known problems in events, set for a fibre as a sum of the following:

          0x1         BC ID
          0x2         L1 ID
          0x4         Timeout
          0x8         May be incorrect
          0x10        Buffer overflow
          0x20-0x8000 Reserved for ATLAS
          0x10000     Almost full
          0x20000     Data overflow
          0x40000     Header bit error
          0x80000     Sync error
          0x100000    Flagged error
          0x200000    Hit pattern (in condensed mode)
          0x400000    Chip sequence
          0x800000    Invalid chip
          0x1000000   Trailer

For upto date information see the ROD operations manual.