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CRC errors have no effect on this statistic.
5.50.21 Transmit Multiple Collision Frames Register (TXMULTICOLL)
The total number of frames transmitted on the EMAC that experienced multiple collisions. Such a frame
is defined as having all of the following:
Was any data or MAC control frame destined for any unicast, broadcast, or multicast address
Was any size
Had no carrier loss and no underrun
Experienced 2 to 15 collisions before being successfully transmitted. None of the collisions were
late.
CRC errors have no effect on this statistic.
5.50.22 Transmit Excessive Collision Frames Register (TXEXCESSIVECOLL)
The total number of frames when transmission was abandoned due to excessive collisions. Such a
frame is defined as having all of the following:
Was any data or MAC control frame destined for any unicast, broadcast, or multicast address
Was any size
Had no carrier loss and no underrun
Experienced 16 collisions before abandoning all attempts at transmitting the frame. None of the
collisions were late.
CRC errors have no effect on this statistic.
5.50.23 Transmit Late Collision Frames Register (TXLATECOLL)
The total number of frames when transmission was abandoned due to a late collision. Such a frame is
defined as having all of the following:
Was any data or MAC control frame destined for any unicast, broadcast, or multicast address
Was any size
Had no carrier loss and no underrun
Experienced a collision later than 512 bit-times into the transmission. There may have been up to 15
previous (non-late) collisions that had previously required the transmission to be reattempted. The
late collisions statistic dominates over the single, multiple, and excessive collisions statistics. If a
late collision occurs, the frame is not counted in any of these other three statistics.
CRC errors, carrier loss, and underrun have no effect on this statistic.
5.50.24 Transmit Underrun Error Register (TXUNDERRUN)
The number of frames sent by the EMAC that experienced FIFO underrun. Late collisions, CRC errors,
carrier loss, and underrun have no effect on this statistic.
5.50.25 Transmit Carrier Sense Errors Register (TXCARRIERSENSE)
The total number of frames on the EMAC that experienced carrier loss. Such a frame is defined as
having all of the following:
Was any data or MAC control frame destined for any unicast, broadcast, or multicast address
Was any size
The carrier sense condition was lost or never asserted when transmitting the frame (the frame is not
retransmitted)
CRC errors and underrun have no effect on this statistic.
SPRUEQ6 – December 2007
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Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)
Ethernet Media Access Controller (EMAC) Registers
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