Ethernet Media Access Controller (EMAC)/ Management Data Input/Output (MDIO) Module User's Guide

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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)
5.50.15 Broadcast Transmit Frames Register (TXBCASTFRAMES)
Ethernet Media Access Controller (EMAC) Registers
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 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:
• 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 (RX nFLOWTHRESH) value was
greater than or equal to the channel's corresponding free buffer register (RX nFREEBUFFER) 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.
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.
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
The total number of good broadcast frames transmitted on the EMAC. A good broadcast frame is
defined as having all of the following:
• Any data or MAC control frame destined for address FF-FF-FF-FF-FF-FFh only
• Was of any length
• Had no late or excessive collisions, no carrier loss, and no underrun
SPRUEQ6 – December 2007 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) 127
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