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EMAC Port Registers
5.50.11 Filtered Receive Frames Register (RXFILTERED)
The total number of frames received on the EMAC that the EMAC address matching process indicated should be discarded. Such a frame is defined as having all of the following:
∙Was any data frame (not MAC control frame) destined for any unicast, broadcast, or multicast address
∙Did not experience any CRC error, alignment error, code error
∙The address matching process decided that the frame should be discarded (filtered) because it did not match the unicast, broadcast, or multicast address, and it did not match due to promiscuous mode.
To determine the number of receive frames discarded by the EMAC for any reason, sum the following statistics (promiscuous mode disabled):
∙Receive fragments
∙Receive undersized frames
∙Receive CRC errors
∙Receive alignment/code errors
∙Receive jabbers
∙Receive overruns
∙Receive filtered frames
This may not be an exact count because the receive overruns statistic is independent of the other statistics, so if an overrun occurs at the same time as one of the other discard reasons, then the above sum
5.50.12 Receive QOS Filtered Frames Register (RXQOSFILTERED)
The total number of frames received on the EMAC that were filtered due to receive quality of service (QOS) filtering. Such a frame is defined as having all of the following:
∙Any data or MAC control frame that matched a unicast, broadcast, or multicast address, or matched due to promiscuous mode
∙The frame destination channel flow control threshold register (RXnFLOWTHRESH) value was greater than or equal to the channel'scorresponding free buffer register (RXnFREEBUFFER) value
∙Was of length 64 to RXMAXLEN
∙RXQOSEN bit is set in RXMBPENABLE
∙Had no CRC error, alignment error, or code error
See Section 2.5.5 for definitions of alignment, code, and CRC errors. Overruns have no effect on this statistic.
5.50.13 Receive Octet Frames Register (RXOCTETS)
The total number of bytes in all good frames received on the EMAC. A good frame is defined as having all of the following:
∙Any data or MAC control frame that matched a unicast, broadcast, or multicast address, or matched due to promiscuous mode
∙Was of length 64 to RXMAXLEN bytes inclusive
∙Had no CRC error, alignment error, or code error
See Section 2.5.5 for definitions of alignment, code, and CRC errors. Overruns have no effect on this statistic.
5.50.14 Good Transmit Frames Register (TXGOODFRAMES)
The total number of good frames transmitted on the EMAC. A good frame is defined as having all of the following:
∙Any data or MAC control frame that was destined for any unicast, broadcast, or multicast address
∙Was any length
∙Had no late or excessive collisions, no carrier loss, and no underrun
SPRU975B | Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) | 139 |
