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GD82559ER — Networking Silicon
62
Datasheet
8.2 Statistical Counters
The 82559ER provides information for network management statistics by providing on-chip
statistical counters that count a variety of events associated with both transmit and receive. The
counters are updated by the 82559ER when it completes the processing of a frame (that is, when it
has completed transmitting a frame on the link or when it has completed receiving a frame). The
Statistical Counters are reported to the software on demand by issuing the Dump Statistical
Counters command or Dump and Reset Statistical Counters command in the SCB Command Unit
Command (CUC) field.
Table 14. 82559ER Statistical Counters
ID Counter Description
0 Transmit Good Frames This counter contains the number of frames that were
transmitted properly on the link. It is updated only after the
actual transmission on the link is completed, not when the
frame was read from memory as is done for the Transmit
Command Block status.
4 Transmit Maximum Collisions
(MAXCOL) Errors
This counter contains the number of frames that were not
transmitted because they encountered the configured
maximum number of collisions.
8 Transmit Late Collisions (LATECOL)
Errors
This counter contains the number of frames that were not
transmitted since they encountered a collision later than the
configured slot time.
12 Transmit Underrun Errors A transmit underrun occurs because the system bus cannot
keep up with the transmission. This counter contains the
number of frames that were either not transmitted or
retransmitted due to a transmit DMA underrun. If the 82559ER
is configured to retransmit on underrun, this counter may be
updated multiple times for a single frame.
16 Transmit Lost Carrier Sense (CRS) This counter contains the number of frames that were
transmitted by the 82559ER despite the fact that it detected
the de-assertion of CRS during the transmission.
20 Transmit Deferred This counter contains the number of frames that were deferred
before transmission due to activity on the link.
24 Transmit Single Collisions This counter contains the number of transmitted frames that
encountered one collision.
28 Transmit Multiple Collisions This counter contains the number of transmitted frames that
encountered more than one collision.
32 Transmit Total Collisions This counter contains the total number of collisions that were
encountered while attempting to transmit. This count includes
late collisions and frames that encountered MAXCOL.
36 Receive Good Frames This counter contains the number of frames that were
received properly from the link. It is updated only after the
actual reception from the link is completed and all the data
bytes are stored in memory.
40 Receive CRC Errors This counter contains the number of aligned frames discarded
because of a CRC error. This counter is updated, if needed,
regardless of the Receive Unit state. The Receive CRC Errors
counter is mutually exclusive of the Receive Alignment Errors
and Receive Short Frame Errors counters.
44 Receive Alignment Errors This counter contains the number of frames that are both
misaligned (for example, CRS de-asserts on a non-octal
boundary) and contain a CRC error. The counter is updated, if
needed, regardless of the Receive Unit state. The Receive
Alignment Errors counter is mutually exclusive of the Receive
CRC Errors and Receive Short Frame Errors counters.