Datasheet

TUSB3410 Bootcode Flow
65
SLLS519H—January 2010 TUSB3410, TUSB3410I
The bootcode uses 0x0451 (Texas Instruments) as the vendor ID and 0x3410 (TUSB3410) as the product ID.
It also supports three different strings and one configuration. Table 11−1 lists the device descriptor.
Table 11−1. Device Descriptor
OFFSET
(decimal)
FIELD SIZE VALUE DESCRIPTION
0 bLength 1 0x12 Size of this descriptor in bytes
1 bDescriptorType 1 1 Device descriptor type
2 bcdUSB 2 0x0110 USB spec 1.1
4 bDeviceClass 1 0xFF Device class is vendor−specific
5 bDeviceSubClass 1 0 We have no subclasses.
6 bDeviceProtocol 1 0 We use no protocols.
7 bMaxPacketSize0 1 8 Max. packet size for endpoint zero
8 idVendor 2 0x0451 USB−assigned vendor ID = TI
10 idProduct 2 0x3410 TI part number = TUSB3410
12 bcdDevice 2 0x100 Device release number = 1.0
14 iManufacturer 1 1 Index of string descriptor describing manufacturer
15 iProducct 1 2 Index of string descriptor describing product
16 iSerialNumber 1 3 Index of string descriptor describing device’s serial number
17 bNumConfigurations 1 1 Number of possible configurations:
11.3.2 Configuration Descriptor
The configuration descriptor provides 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
(decimal)
FIELD SIZE VALUE DESCRIPTION
0 bLength 1 9 Size of this descriptor in bytes.
1 bDescriptor Type 1 2 Configuration descriptor type
2 wTotalLength 2 25 = 9 + 9 + 7
Total length of data returned for this configuration. Includes the combined length
of all descriptors (configuration, interface, endpoint, and class- or
vendor-specific) returned for this configuration.
4 bNumInterfaces 1 1 Number of interfaces supported by this configuration
5 bConfigurationValue 1 1
Value to use as an argument to the SetConfiguration() request to select this
configuration.
6 iConfiguration 1 0 Index of string descriptor describing this configuration.
7 bmAttributes 1 0x80
Configuration characteristics
D7: Reserved (set to one)
D6: Self-powered
D5: Remote wakeup is supported
D4−0: Reserved (reset to zero)
8 bMaxPower 1 0x32 This device consumes 100 mA.