R6764-63 Ver la hoja de datos (PDF) - Conexant Systems

Número de pieza

componentes Descripción

Lista de partido

R6764-63

Integrated V.90/K56flex Modem Device Sets with USB Interface for Desktop Applications

Conexant Systems 

5&'86%

,QWHJUDWHG9.IOH[0RGHP'HYLFH6HWVZLWK86%,QWHUIDFH

Interface Descriptor

An interface descriptor describes a specific interface provided by the associated configuration (see Table 5). It is always

returned as part of a configuration descriptor. An interface descriptor never includes endpoint zero in the number of

endpoints.

Offset

0

1

2

Field

bLength

bDescriptorType

bInterfaceNumber

3

bAlternateSetting

4

bNumEndpoints

5

bInterfaceClass

6

bInterfaceSubClass

7

bInterfaceProtocol

8

iInterface

Size

1

1

1

1

1

1

1

1

1

Table 5. Interface Descriptors

Value

Default

Description

Number

Constant

Number

Number

Number

Class

SubClass

Protocol

Index

09

Size of this descriptor in bytes.

04

INTERFACE Descriptor Type.

00

Number of interface. Zero-based value identifying the index in the

array of concurrent interfaces supported by this configuration.

00

Value used to select alternate setting for the interface identified in

the prior field.

04

Number of endpoints used by this interface (excluding endpoint

zero). If this value is 0, this interface only uses endpoint zero.

00

Class code (assigned by USB).

If this field is reset to 0, the interface does not belong to any USB

specified device class.

If this field is set to 0xFF, the interface class is vendor specific.

All other values are reserved for assignment by USB.

00

Subclass code (assigned by USB). These codes are qualified by the

value of the bInterfaceClass field.

If the bInterfaceClass field is reset to 0, this field must also be reset

to 0.

If the bInterfaceClass field is not set to 0xFF, all values are reserved

for assignment by USB.

00

Protocol code (assigned by USB). These codes are qualified by the

value of the bInterfaceClass and the bInterfaceSubClass fields. If an

interface supports class-specific requests, this code identifies the

protocols that the device uses as defined by the specification of the

device class.

If this field is reset to 0, the device does not use a class specific

protocol on this interface.

If this field is set to 0xFF, the device uses a vendor specific protocol

for this interface.

00

Index of string descriptor describing this interface.



0'

Share Link: