Texas Instruments TMS320DM36X manual Pause Transmit Frames Register Txpauseframes

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5.50.17 Pause Transmit Frames Register (TXPAUSEFRAMES)

The total number of IEEE 802.3X pause frames transmitted by the EMAC. Pause frames cannot underrun or contain a CRC error because they are created in the transmitting MAC, so these error conditions have no effect on this statistic. Pause frames sent by software are not included in this count. Since pause frames are only transmitted in full-duplex mode, carrier loss and collisions have no effect on this statistic.

Transmitted pause frames are always 64-byte multicast frames so appear in the multicast transmit frames register and 64 octet frames register statistics.

5.50.18 Deferred Transmit Frames Register (TXDEFERRED)

The total number of frames transmitted on the EMAC that first experienced deferment. 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 no collisions before being successfully transmitted

•Found the medium busy when transmission was first attempted, so had to wait.

CRC errors have no effect on this statistic.

5.50.19 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.

5.50.20 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.

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.

SPRUFI5B –March 2009 –Revised December 2010 Ethernet Media Access Controller (EMAC)/Management Data Input/Output 127

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