Table of Contents
Advertisement
Registers
3.3.2.50.19 Transmit Collision Frames Register (TXCOLLISION)
The total number of times that the EMAC experienced a collision. Collisions occur under two
circumstances:
•
When a transmit data or MAC control frame has all of the following:
– Was destined for any unicast, broadcast, or multicast address
– Was any size
– Had no carrier loss and no underrun
– Experienced a collision. A jam sequence is sent for every non-late collision, so this statistic
increments on each occasion if a frame experiences multiple collisions (and increments on late
collisions).
•
When the EMAC is in half-duplex mode, flow control is active, and a frame reception begins.
CRC errors have no effect on this statistic.
3.3.2.50.20 Transmit Single Collision Frames Register (TXSINGLECOLL)
The total number of frames transmitted on the EMAC that experienced exactly one 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 one collision before successful transmission. The collision was not late.
CRC errors have no effect on this statistic.
3.3.2.50.21 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.
3.3.2.50.22 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.
510
EMAC/MDIO Module
Preliminary
© 2011, Texas Instruments Incorporated
www.ti.com
SPRUGX9 – 15 April 2011
Submit Documentation Feedback
Advertisement
Table of Contents
