LAN9730 datasheet(41/222 Pages) MICROCHIP

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DS00001946A-page 41

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.

Error conditions are indicated via the RX Status Word, Table 4-40, or the TX Status Word, Table 4-44.

Note:

The counters are snapshot when fulfilling the command request. The statistics counters rollover.

TABLE 4-14:

STATISTIC COUNTERS

Name

Description

Size

(Bits)

RX Good Frames

Number of good RX frames received. Includes frames dropped by the

FCT.

RX CRC Errors

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.

RX Runt Frame Errors

Number of RX frames received with a length of less than 64 bytes and a

CRC error.

RX Alignment Errors

Number of RX frames received with alignment errors.

An alignment error is indicated by the presence of the CRC error flag

and the dribbling bit flag is set.

RX Frame Too Long Error

Number of RX frames received with a length greater than the pro-

grammed maximum Ethernet frame size.

RX Later Collision Error

Number of RX frames received where a late collision has occurred.

RX Bad Frames

Total number of errored Ethernet frames received. This counter does not

include RX FIFO Dropped Frames.

RX FIFO Dropped Frames

Number of RX frames dropped by the FCT due to insufficient room in the

RX FIFO.

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

Number of successfully transmitted TX frames.

Does not count pause frames.

TX Pause Frames

Number of successfully transmitted pause frames.

TX Single Collisions

Number of successfully transmitted frames with one collision.

TX Multiple Collisions

Number of successfully transmitted frames with more than one collision.

TX Excessive Collision Errors

Number of transmitted frames aborted due to excessive collisions.

TX Late Collision Errors

Number of transmitted frames aborted due to late collisions.

TX Buffer Underrun Errors

Number of transmitted frames aborted due to Tx buffer under run.

TX Excessive Deferral Errors

Number of transmitted frames aborted due to excessive deferrals.

TX Carrier Errors

Number of frames transmitted in which the carrier signal was lost or in

which the carrier signal was not present.

TX Bad Frames

Total number of errored Ethernet frames transmitted.

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