LAN89730 datasheet(47/218 Pages) MICROCHIP

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DS60001348A-page 47

LAN89730

4.3.3

USB VENDOR COMMANDS

The device implements several vendor specific commands in order to access CSRs and efficiently gather statistics. The

vendor commands allow direct access to Systems CSRs and MAC CSRs.

4.3.3.1

The commands allows the host to write a single register. Burst writes are not supported. All writes are 32-bits.

4.3.3.2

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

Note:

When in the Normal state, accesses to the MAC CSRs are stalled.

TABLE 4-33:

FORMAT OF REGISTER WRITE SETUP STAGE

Offset

Field

Value

bmRequestType

40h

bRequest

A0h

wValue

00h

wIndex

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

wLength

04h

TABLE 4-34:

FORMAT OF REGISTER WRITE DATA STAGE

Offset

Field

TABLE 4-35:

FORMAT OF REGISTER READ SETUP STAGE

Offset

Field

Value

bmRequestType

C0h

bRequest

A1h

wValue

00h

wIndex

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

wLength

04h

TABLE 4-36:

FORMAT OF REGISTER READ DATA STAGE

Offset

Field

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