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5.50.11 Filtered Receive Frames Register (RXFILTERED)
5.50.12 Receive QOS Filtered Frames Register (RXQOSFILTERED)
5.50.13 Receive Octet Frames Register (RXOCTETS)
5.50.14 Good Transmit Frames Register (TXGOODFRAMES)
EMAC Port Registers
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:
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.
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):
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 double-counts that frame.
statistics, so if an overrun occurs at the same time as one of the other discard reasons, then the above
sum double-counts that frame.
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:
(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
due to promiscuous mode
•
The frame destination channel flow control threshold register (RXnFLOWTHRESH) value was greater
than or equal to the channel's corresponding free buffer register (RXnFREEBUFFER) value
than or equal to the channel's corresponding 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
for definitions of alignment, code, and CRC errors. Overruns have no effect on this
statistic.
The total number of bytes in all good frames received on the EMAC. A good frame is defined as having all
of the following:
of the following:
•
Any data or MAC control frame that matched a unicast, broadcast, or multicast address, or matched
due to promiscuous mode
due to promiscuous mode
•
Was of length 64 to RXMAXLEN bytes inclusive
•
Had no CRC error, alignment error, or code error
See
for definitions of alignment, code, and CRC errors. Overruns have no effect on this
statistic.
The total number of good frames transmitted on the EMAC. A good frame is defined as having all of the
following:
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 – August 2006
Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)
139