Network Card User Manual

www.ti.com Ethernet Media Access Controller (EMAC) Registers
5.50.8 Receive Jabber Frames Register (RXJABBER)
The total number of jabber frames received on the EMAC. A jabber frame is defined as having all of the
following:
• Was any data or MAC control frame that matched a unicast, broadcast, or multicast address, or
matched due to promiscuous mode
• Was greater than RXMAXLEN bytes long
• Had a CRC error, alignment error, or code error
See Section 2.6.5 for definitions of alignment, code, and CRC errors. Overruns have no effect on this
statistic.
5.50.9 Receive Undersized Frames Register (RXUNDERSIZED)
The total number of undersized frames received on the EMAC. An undersized frame is defined as
having all of the following:
• Was any data frame that matched a unicast, broadcast, or multicast address, or matched due to
promiscuous mode
• Was less than 64 bytes long
• Had no CRC error, alignment error, or code error
See Section 2.6.5 for definitions of alignment, code, and CRC errors. Overruns have no effect on this
statistic.
5.50.10 Receive Frame Fragments Register (RXFRAGMENTS)
The total number of frame fragments received on the EMAC. A frame fragment is defined as having all
of the following:
• Any data frame (address matching does not matter)
• Was less than 64 bytes long
• Had a CRC error, alignment error, or code error
• Was not the result of a collision caused by half duplex, collision based flow control
See Section 2.6.5 for definitions of alignment, code, and CRC errors. Overruns have no effect on this
statistic.
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
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SPRUFI5B–March 2009–Revised December 2010 Ethernet Media Access Controller (EMAC)/Management Data Input/Output
(MDIO)
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