This bit field counts
the number of frames that had GRXER asserted during reception. For 10/100 mode symbol
errors are counted regardless of frame length checks. Receive symbol errors will also be counted as an FCS or alignment
error if the frame is between 64 and 1518 Bytes (1536 Bytes if NCFGR.MAXFS=1). If the frame is
larger it will be recorded as a jabber error.
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