DWG Smart-Card Integrated Circuit(s) Card Interface Devices
4 Standard USB Descriptors
4.1 Device
It is a standard device descriptor as per Chapter 9, “USB Device Framework,” in the
Universal Serial Bus Specification.
It does not contain class-specific information.
4.2 Configuration
It is a standard configuration descriptor as per Chapter 9, “USB Device Framework,” in
the Universal Serial Bus Specification.
It does not contain class-specific information.
4.3 Interface
The Interface descriptor contains the class, subclass, and protocol as per table Table
4.3-1.
Table 4.3-1 Interface Descriptor
Offset Field Size Value Description
0 bLength 1 09h Size of this descriptor in bytes.
1 bDescriptorType 1 04h INTERFACE descriptor type.
2 bInterfaceNumber 1 Number Number of this interface. Zero-based value identifying the index in
the array of concurrent interfaces supported by this configuration.
3 bAlternateSetting 1 Number Value used to select this alternate setting for the interface
identified in the prior field.
4 bNumEndpoints 1 02h
03h
Number of endpoints used by this interface (excluding endpoint
zero).
For Integrated Circuit(s) Cards Interface Devices (CCID)
02h uses bulk-IN and bulk-OUT
03h uses bulk-IN, bulk-OUT and interrupt –IN
5 bInterfaceClass 1 0Bh Smart Card Device Class.
6 bInterfaceSubClass 1 00h Subclass code.
7 bInterfaceProtocol 1
00h
Protocol code
For Integrated Circuit(s) Cards Interface Devices (CCID)
00h
Note: For competitiveness, values 01h and 02h are reserved for
Integrated Circuit(s) Cards Devices (USB-ICC) and other values
are reserved for future use. USB-ICCs are out of the scope of this
specification.
8 iInterface 1 Index Index of string descriptor this interface.
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