The register counts
frames that are an integral number of bytes, have bad CRC and are between 64 and 1518
bytes in length (1536 Bytes if GMAC_NCFGR.MAXFS is written to '1', 10240 Bytes if
GMAC_NCFGR.JFRAME=1). This register is also incremented if a symbol error is detected
and the frame is of valid length and has an integral number of bytes.This register is incremented for a frame with bad FCS,
regardless of whether it is copied to memory due to ignore FCS mode (enabled by
writing GMAC_NCFGR.IRXFCS=1).