Intel manual 82559ER Statistical Counters, GD82559ER - Networking Silicon, Datasheet

GD82559ER — Networking Silicon

8.2Statistical 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	This counter contains the number of frames that were not
	(MAXCOL) Errors	transmitted because they encountered the configured
		maximum number of collisions.
8	Transmit Late Collisions (LATECOL)	This counter contains the number of frames that were not
	Errors	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.

62 Datasheet