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EMAC Port Registers
5.50.3 Multicast Receive Frames Register (RXMCASTFRAMES)
The total number of good multicast frames received on the EMAC. A good multicast frame is defined as
having all of the following:
• Any data or MAC control frame that was destined for any multicast address other than
FF-FF-FF-FF-FF-FFh
• Was of length 64 to RXMAXLEN bytes inclusive
• Had no CRC error, alignment error, or code error
See Section 2.5.5 for alignment/code/CRC error definitions. Overruns have no effect on this statistic.
5.50.4 Pause Receive Frames Register (RXPAUSEFRAMES)
The total number of IEEE 802.3X pause frames received by the EMAC (whether acted upon or not). A
pause frame is defined as having all of the following:
• Contained any unicast, broadcast, or multicast address
• Contained the length/type field value 88.08h and the opcode 0001h
• Was of length 64 to RXMAXLEN bytes inclusive
• Had no CRC error, alignment error, or code error
• Pause-frames had been enabled on the EMAC (TXFLOWEN bit is set in MACCONTROL).
The EMAC could have been in either half-duplex or full-duplex mode. See Section 2.5.5 for
alignment/code/CRC error definitions. Overruns have no effect on this statistic.
5.50.5 Receive CRC Errors Register (RXCRCERRORS)
The total number of frames received on the EMAC that experienced a CRC error. A frame with CRC
errors 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 of length 64 to RXMAXLEN bytes inclusive
• Had no alignment or code error
• Had a CRC error. A CRC error is defined as having all of the following:
– A frame containing an even number of nibbles
– Fails the frame check sequence test
See Section 2.5.5 for definitions of alignment and code errors. Overruns have no effect on this statistic.
5.50.6 Receive Alignment/Code Errors Register (RXALIGNCODEERRORS)
The total number of frames received on the EMAC that experienced an alignment error or code error.
Such a 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 of length 64 to RXMAXLEN bytes inclusive
• Had either an alignment error or a code error
– An alignment error is defined as having all of the following:
• A frame containing an odd number of nibbles
• Fails the frame check sequence test, if the final nibble is ignored
– A code error is defined as a frame that has been discarded because the EMACs MRXER pin is
driven with a one for at least one bit-time's duration at any point during the frame's reception.
Overruns have no effect on this statistic.
CRC alignment or code errors can be calculated by summing receive alignment errors, receive code
errors, and receive CRC errors.
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SPRUEF8F–March 2006–Revised November 2010 C6472/TCI6486 EMAC/MDIO
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