LAN9730 Datasheet, PDF (41/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
4.3.1.7 Statistics
The CTL tracks the statistics listed in Table 4-14. The statistics are read via the Get Statistics Vendor Command.
Note: The counters are snapshot when fulfilling the command request. The statistics counters rollover.
Error conditions are indicated via the RX Status Word, Table 4-40, or the TX Status Word, Table 4-44.
TABLE 4-14: STATISTIC COUNTERS
Name
RX Good Frames
RX CRC Errors
Description
Number of good RX frames received. Includes frames dropped by the
FCT.
Number of RX frames received with CRC-32 errors.
A CRC error is indicated when the CRC error flag is set and the dribbling
bit flag is not set.
Size
(Bits)
32
20
RX Runt Frame Errors
RX Alignment Errors
Number of RX frames received with a length of less than 64 bytes and a
CRC error.
20
Number of RX frames received with alignment errors.
An alignment error is indicated by the presence of the CRC error flag
20
and the dribbling bit flag is set.
RX Frame Too Long Error
RX Later Collision Error
RX Bad Frames
RX FIFO Dropped Frames
Number of RX frames received with a length greater than the pro-
grammed maximum Ethernet frame size.
20
Number of RX frames received where a late collision has occurred.
20
Total number of errored Ethernet frames received. This counter does not
include RX FIFO Dropped Frames.
20
Number of RX frames dropped by the FCT due to insufficient room in the
RX FIFO.
20
If an RX FIFO Dropped Frame has an Ethernet error, i.e., CRC error, it
must only be counted by the RX FIFO Dropped Frames counters.
TX Good Frames
TX Pause Frames
TX Single Collisions
TX Multiple Collisions
Number of successfully transmitted TX frames.
Does not count pause frames.
32
Number of successfully transmitted pause frames.
20
Number of successfully transmitted frames with one collision.
20
Number of successfully transmitted frames with more than one collision. ₂₀
TX Excessive Collision Errors ^{Number of transmitted frames aborted due to excessive collisions.}
20
TX Late Collision Errors
Number of transmitted frames aborted due to late collisions.
20
TX Buffer Underrun Errors
Number of transmitted frames aborted due to Tx buffer under run.
20
TX Excessive Deferral Errors ^{Number of transmitted frames aborted due to excessive deferrals.}
20
TX Carrier Errors
Number of frames transmitted in which the carrier signal was lost or in
which the carrier signal was not present.
20
TX Bad Frames
Total number of errored Ethernet frames transmitted.
20
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DS00001946A-page 41