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3.3.2.50.23 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.
3.3.2.50.24 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.
3.3.2.50.25 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.
3.3.2.50.26 Transmit Octet Frames Register (TXOCTETS)
The total number of bytes in all 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
3.3.2.50.27 Transmit and Receive 64 Octet Frames Register (FRAME64)
The total number of 64-byte frames received and transmitted on the EMAC. Such a 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
•
Did not experience late collisions, excessive collisions, underrun, or carrier sense error
•
Was exactly 64-bytes long. (If the frame was being transmitted and experienced carrier loss that
resulted in a frame of this size being transmitted, then the frame is recorded in this statistic).
CRC errors, alignment/code errors, and overruns do not affect the recording of frames in this statistic.
SPRUGX9 – 15 April 2011
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Preliminary
© 2011, Texas Instruments Incorporated
Registers
511
EMAC/MDIO Module
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