mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 287

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
12.3.3.2 USB Device Configuration Example
The example descriptor structure in Figure 12-23 shows a device with three different
configurations. Refer to Chapter 9 of the USB Specification for information on the contents
of each descriptor.
This example is described in the configuration RAM sequence shown below. The device
descriptor begins at address MBAR + 0x1400. Each descriptor must immediately follow
the previous descriptor without any empty locations between them.
1. Device Descriptor
2. Configuration #1 Descriptor
3. Interface #0 Descriptor
4. Endpoint #1 Descriptor
5. Endpoint #2 Descriptor
6. Interface #1 Descriptor
7. Endpoint #3 Descriptor
8. Configuration #2 Descriptor
9. Interface #0 Descriptor
10. Endpoint #1 Descriptor
11. Configuration #3 Descriptor
12. Interface #0 Descriptor
13. Endpoint #1 Descriptor
14. Endpoint #2 Descriptor
Endpoint #1
Descriptor
Figure 12-23. Example USB Configuration Descriptor Structure
Interface #0
Descriptor
Endpoint #2
Descriptor
Configuration #1
Descriptor
Chapter 12. Universal Serial Bus (USB)
Interface #1
Endpoint #3
Descriptor
Descriptor
Descriptor
Device
Configuration #2
Register Description and Programming Model
Endpoint #1
Interface #0
Descriptor
Descriptor
Descriptor
Endpoint #1
Descriptor
Configuration #3
Interface #0
Descriptor
Descriptor
Endpoint #2
Descriptor
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