LAN9500AI datasheet(36/213 Pages) MICROCHIP

36 / 213 page

LAN950x

DS00001875A-page 36

 2010 - 2015 Microchip Technology Inc.

String Indices 1-5

Note 1: If there is no valid/enabled EEPROM, or if the corresponding String Length and offset in the EEPROM for a

give string index are zero, then that string does not exist, so any host attempt to read that string will return

stall in the Data Stage of the Control Transfer.

2: The device returns whatever bytes are in the designated EEPROM area for each of these strings it is the

responsibility of the EEPROM programmer to correctly set the bLength and bDescriptorType fields in the

descriptor consistent with the byte length specified in the corresponding EEPROM locations.

5.3.1.7

Statistics

The CTL tracks the statistics listed in Table 5-14. The statistics are read via the Get Statistics Vendor Command.

Error conditions are indicated via the RX Status Word, Table 5-40 on page 45, or the TX Status Word, Table 5-44 on

page 50.

TABLE 5-13:

STRING DESCRIPTOR (INDICES 1-5)

Offset

Field

Size

(Bytes)

Default

Value

Loaded

from

EEPROM

Description

00h

bLength

none

Yes

Size of the String Descriptor in bytes (4

bytes)

01h

bDescriptorType

none

Yes

String Descriptor (0x03)

02h

Unicode String

2*N

none

Yes

2 bytes per unicode character, no

trailing NULL.

Note:

(LAN9500/LAN9500i ONLY):

The counters do not rollover and they are cleared on read.

(LAN9500A/LAN9500Ai ONLY):

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

TABLE 5-14:

STATISTICS 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.

Note:

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.

Note:

An alignment error is indicated by the presence of the CRC

error flag is set and the dribbling bit flag is set.

RX Frame Too Long Error

Number of RX frames received with a length greater than the

programmed 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.

Note:

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.

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