NET2890 datasheet(58/73 Pages) ETC

58 / 73 page

Specification

NET2890 USB Interface Controller

____________________________________________________________________________________

NetChip Technology, Inc., 1999

335 Pioneer Way, Mountain View, California 94041

TEL (650) 526-1490

FAX (650) 526-1494

http://www.netchip.com

Rev 2.0, Draft 9, July 16, 1999

6.1.5 Get Configuration Descriptor (55 bytes)

The NET2890 can support a variety of configurations, interfaces, and endpoints, each of which is defined

by the descriptor data returned to the host. The local CPU has the responsibility of providing this data to

the NET2890 when the host requests it.

This example has one configuration, and two interfaces, each with two endpoints. The first interface defines

one Bulk OUT endpoint at address 1 with maximum packet size of 8 and one Interrupt IN endpoint at

address 82h (endpoint number = 2) with a maximum packet size of 8. The second interface defines one

Bulk OUT endpoint at address 3 with maximum packet size of 64 and one Bulk IN endpoint at address 84h

(endpoint number = 4) with a maximum packet size of 64.

Note that all interface and endpoint descriptors are returned in response to a Get Configuration Descriptor

request.

Offset

Number of

Bytes

Description

Suggested

Value

Configuration Descriptor

Length

09h

Type (configuration)

02h

Total length returned for this configuration

0037h

Number of Interfaces

02h

Number of this configuration

01h

Index of string descriptor describing this configuration

00h

Attributes

bit 7 = Bus Powered

bit 6 = Self-Powered

bit 5 = Remote-Wakeup

bits 4:0 = Reserved

Maximum USB power required (in 2 mA units)

Interface 0 Descriptor

Size of this descriptor in bytes

09h

Type (interface)

04h

Number of this interface

00h

Alternate Interface

00h

Number of endpoints used by this interface

(excluding Endpoint 0)

02h

Class Code

00h

Sub Class Code

00h

Device Protocol

00h

Index of string descriptor describing this interface

00h

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