TUSB3410 datasheet(74/92 Pages) TI

74 / 92 page

11–4

11.3.3 Interface Descriptor

The interface descriptor describes the number of endpoints supported by this interface as well as interface class,

subclass, and protocol.

The bootcode supports only one endpoint and use its own class. Table 11–3 lists the interface descriptor.

Table 11–3. Interface Descriptor

OFFSET

FIELD

SIZE

VALUE

DESCRIPTION

bLength

Size of this descriptor in bytes

bDescriptorType

Interface descriptor type

bInterfaceNumber

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

interfaces supported by this configuration.

bAlternateSetting

Value used to select alternate setting for the interface identified in the prior field

bNumEndpoints

Number of endpoints used by this interface (excluding endpoint zero). If this value is

zero, this interface only uses the default control pipe.

bInterfaceClass

0xFF

The interface class is vendor specific.

bInterfaceSubClass

bInterfaceProtocol

iInterface

Index of string descriptor describing this interface

11.3.4 Endpoint Descriptor

The endpoint descriptor describes the type and size of communication pipe supported by this endpoint.

The bootcode supports only one output endpoint with the size of 64 bytes in addition to control endpoint 0 (required

by all USB devices). Table 11–4 lists the endpoint descriptor.

Table 11–4. Output Endpoint1 Descriptor

OFFSET

FIELD

SIZE

VALUE

DESCRIPTION

bLength

Size of this descriptor in bytes

bDescriptorType

Endpoint descriptor type

bEndpointAddress

0x01

Bit 3

…0: The endpoint number

Bit 7:

Direction

0 = OUT endpoint

1 = IN endpoint

bmAttributes

Bit 1

…0: Transfer type

10 = Bulk

11 = Interrupt

wMaxPacketSize

Maximum packet size this endpoint is capable of sending or receiving when this

configuration is selected.

bInterval

Interval for polling endpoint for data transfers. Expressed in milliseconds.

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