[EZ-USB FX3] USB 3.0 Additional Descriptors

SuperSpeed USB 3.0 增加兩個新的 descriptors, 用來儲存 technology 及 device function 的特定資訊.

Binary device Object Store (BOS)

BOS descriptor 作為一個或是更多的 device capability descriptor 的基礎的 descriptor, 提供特定的能力和技術的資訊.
所有的 SuperSpeed USB 3.0 設備都必需支援這一個 descriptor, 並且在 high speed 運行時, 支援 Link Power Management (LPM).

Offset	Field	Size	Value	Description
0	bLength	1	Number	Size of Descriptor in bytes	0x05
1	bDescriptorType	1	Constant	BOS Descriptor	0x0F
2	wTotalLength	2	Number	The number of bytes in this descriptor and all of its subordinate descriptors	include all sub desceiptors
4	bNumDeviceCaps	1	Number	The number of device capability descriptors subordinate to this BOS descriptor.

Device Capability Descriptor

Device Capability Descriptor 描述各不同 Device 的 capability

Offset	Field	Size	Value	Description
0	bLength	1	Number	Size of Descriptor in bytes
1	bDescriptorType	1	Constant	DevCapability Descriptor	0x10
2	bDevCapabilityType	1	Number	Device Capability Type
3	Capability-Dependent	Var	Variable	Capability-specific data and format

 

Device Capability Types Codes

Capability Code	Value	Descriptor
Wireless_USB	01H	Defines the set of Wireless USB-specific device level capabilities
USB 2.0 Extension	02H	USB 2.0 Extension Descriptor
SUPERSPEED_USB	03H	Defines the set of SuperSpeed USB specific device level capabilities
CONTAINER_ID	04H	Defines the instance unique ID used to identify the instance across all operating modes
PLATFORM	05H	Defines a device capability specific to a particular platform/operating system
POWER_DELIVERY_CAPABILITY	06H	Defines the various PD Capabilities of this device
BATTERY_INFO_CAPABILITY	07H	Provides information on each battery supported by the device
PD_CONSUMER_PORT_CAPABILITY	08H	The consumer characteristics of a port on the device
PD_PROVIDER_PORT_CAPABILITY	09H	The provider characteristics of a port on the device
SUPERSPEED_PLUS	0AH	Defines the set of SuperSpeed Plus USB specific device level capabilities
PRECISION_TIME_MEASUREMENT	0BH	Precision Time Measurement (PTM) Capability Descriptor
Wireless_USB_Ext	0CH	Defines the set of Wireless USB 1.1-specific device level capabilities
Reserved	00H, 0DH~FFH	Reserved for future use