12.2.2.4.6.19.7 IET Receive Merge Fragment Count (Offset = 3A14Ch)
The total number of received non-initial fragments that did not have an assembly error. The IET stat CPSW_STAT_RXFRAGMENTS_k is derived by adding the Receive Assembly Error count to this value.
any frame received
was any size, and
was a non-initial fragment that did not contain an assembly error