LAN9500AI datasheet(42/213 Pages) MICROCHIP

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LAN950x

DS00001875A-page 42

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5.3.3.2

The commands allows the Host to read a single register. Burst reads are not supported. All reads return 32-bits.

5.3.3.3

Get Statistics Command

The Get Statistics Command returns the entire contents of the statistics RAMs. The wIndex field is used to select the

RX or TX statistics.

Note 5-19

0b - Retrieves RX statistics. 1b - Retrieves TX statistics.

Note 5-20

20h for RX statistics. 28h for TX statistics.

TABLE 5-35:

FORMAT OF REGISTER READ SETUP STAGE

Offset

Field

Value

bmRequestType

C0h

bRequest

A1h

wValue

00h

wIndex

{0h, CSR Address[11:0]}

wLength

04h

TABLE 5-36:

FORMAT OF REGISTER READ DATA STAGE

Offset

Field

Note:

(LAN9500/LAN9500i ONLY):

The contents of the statistics RAM is cleared after the command is processed.

(LAN9500A/LAN9500Ai ONLY):

The contents of the statistics RAM is snapshot when fulfilling the command request. The statistics counters

rollover, hence the RAM is not cleared.

TABLE 5-37:

FORMAT OF GET STATISTICS SETUP STAGE

Offset

Field

Value

bmRequestType

C0h

bRequest

A2h

wValue

00h

wIndex

Note 5-19

wLength

Note 5-20

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