Public Version
Device Initialization by ROM Code
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Table 26-15. Device Descriptor (continued)
Field
Value
Description
idVendor
0x0451
Vendor ID (TI default table)
idProduct
Device-specific (0xD00E)
Product ID (TI default table)
bcdDevice
0x0000
Device release number
iManufacturer
See values in
.
Index of string descriptor describing
manufacturer
iProduct
See values in
.
Index of string descriptor describing
product
iSerialNumber
See values in
.
Index of string descriptor describing
device serial number
bNumConfigurations
0x01
Number of possible configurations
•
Device-qualifier descriptor
The device-qualifier descriptor contains information about a HS-capable device that changes if the
device operates at its other speed. This descriptor is retrieved by the host using the GetDescriptor()
request (standard device request).
describes a device-qualifier descriptor.
Table 26-16. Device-Qualifier Descriptor
Field
Value
Description
bLength
0x0a
Size of this descriptor in bytes
bDescriptorType
0x06
Device-qualifier descriptor type
bcdUSB
0x0210
USB specification release number in BCD
bDeviceClass
0xFF
Class code
bDeviceSubClass
0xFF
Subclass code
bDeviceProtocol
0xFF
Protocol code
bMaxPacketSize0
0x40
Maximum packet size for endpoint 0
bNumConfigurations
0x01
Number of possible configurations
bReserved
0x00
Reserved for future use
•
Configuration descriptor
This descriptor gives information about a specific device configuration. The descriptor describes the
number of interfaces supported by the configuration. See
for details.
Table 26-17. Configuration Descriptor
Field
Value
Description
bLength
0x09
Size of this descriptor in bytes
bDescriptorType
0x02
Configuration descriptor type
wTotalLength
-
Combined length of all descriptors
bNumInterfaces
0x01
Number of interfaces supported
bConfigurationValue
0x01
Value to use as an argument for the
SetConfiguration() request
iConfiguration
Index
Index of string descriptor describing this configuration
bmAttributes
0xc0
Power setting and remote wakeup
bMaxPower
0x32
Maximum power consumption of the USB device
•
Other speed configuration descriptor
This descriptor describes the configuration of a HS-capable device if it operates at its other possible
speed. See
for details.
3536
Initialization
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated