During MPC8548 Ethernet testing, we have observed that when a Tx frame is truncated, the eTSEC always sends exactly (MAXFRM + 5) bytes. It doesn’t matter how many bytes over MAXFRM you were trying to send (1, 1000, etc…). Looking at the extra 5 bytes, the first one is an extra valid data byte from the transmit buffer (i.e. txbuf[MAXFRM]). The last 4 look random. They are not data and they are not a valid CRC. Is this the expected MPC8548 eTSEC behavior?