TUSB3410 datasheet(73/92 Pages) TI

73 / 92 page

11–3

11.3.1 Device Descriptor

Device descriptor describes the USB version that the device supports, device class, protocol, vendor, product

identifications, strings, and number of configuration. The OS (operation system like Windows, MAC, or Linux) reads

this descriptor to decide which device driver should be used to communicate to this device.

The bootcode uses 0x0451(Texas Instruments) as vendor ID and 0x3410(TUSB3410) as product ID. It also supports

three different strings and one configuration. Table 11–1 lists the device descriptor.

Table 11–1. Device Descriptor

OFFSET

FIELD

SIZE

VALUE

DESCRIPTION

bLength

0x12

Size of this descriptor in bytes

bDescriptorType

Device Descriptor type

bcdUSB

0x0110

USB spec 1.1

bDeviceClass

0xFF

Device class is vendor–specific

bDeviceSubClass

We have no subclasses.

bDeviceProtocol

We use no protocols.

bMaxPacketSize0

Max. packet size for endpoint zero

idVendor

0x0451

USB–assigned vendor ID = TI

idProduct

0x3410

TI part number = TUSB3410

bcdDevice

0x100

Device release number = 1.0

iManufacturer

Index of string descriptor describing manufacturer

iProducct

Index of string descriptor describing product

iSerialNumber

Index of string descriptor describing device’s serial number

bNumConfigurations

Number of possible configurations:

11.3.2 Configuration Descriptor

The configuration descriptor describes the number of interfaces supported by this configuration, power configuration,

and current consumption.

The bootcode declares only one interface running in bus-powered mode. It consumes up to 100 mA at boot time.

Table 11–2 lists the configuration descriptor.

Table 11–2. Configuration Descriptor

OFFSET

FIELD

SIZE

VALUE

DESCRIPTION

bLength

Size of this descriptor in bytes.

bDescriptor Type

Configuration descriptor type

wTotalLength

25 = 9 + 9 + 7

Total length of data returned for this configuration. Includes the combined length

all

descriptors

(configuration,

interface,

endpoint,

and

class-

vendor-specific) returned for this configuration.

bNumInterfaces

Number of interfaces supported by this configuration

bConfigurationValue

Value to use as an argument to the SetConfiguration() request to select this

configuration.

iConfiguration

Index of string descriptor describing this configuration.

bmAttributes

0x80

Configuration characteristics

D7:

Reserved (set to one)

D6:

Self-powered

D5:

Remote wakeup is supported

D4–0:

Reserved (reset to zero)

bMaxPower

0x32

This device consumes 100 mA.

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