The Device Layer initialization process requires the following components:

• USB Standard Descriptors that define the device functionality. The definitions of these descriptors are defined by the USB 2.0 and Device Class specification.
• Device Master Descriptor Table
• Function Driver Registration Table

The USB Standard Descriptors that define the device functionality are discussed in detail in the USB 2.0 and Device Class Specifications. The reader is encouraged to refer to these specifications for a detailed understanding of this topic. The Device Layer does not impose any additional requirements on Device descriptors.