使用到工具USBlyzer导出数据，但是会发现一些还有部分解析未完全。我们将借助UVCView.x86(https://files.cnblogs.com/files/libra13179/77772349UVCView.x86.rar)来进一步来分析。(懒人专用)
| Connection Status | Device connected |
| Current Configuration | 1 |
| Speed | High (480 Mbit/s) |
| Device Address | 4 |
| Number Of Open Pipes | 1 |
Device Descriptor USB2.0 UVC PC Camera
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 12h | |
| 1 | bDescriptorType | 1 | 01h | Device |
| 2 | bcdUSB | 2 | 0200h | USB Spec 2.0 |
| 4 | bDeviceClass | 1 | EFh | Miscellaneous |
| 5 | bDeviceSubClass | 1 | 02h | Common Class |
| 6 | bDeviceProtocol | 1 | 01h | Interface Association Descriptor |
| 7 | bMaxPacketSize0 | 1 | 40h | 64 bytes |
| 8 | idVendor | 2 | 05E3h | Genesys Logic, Inc. |
| 10 | idProduct | 2 | 0510h | |
| 12 | bcdDevice | 2 | 0319h | 3.19 |
| 14 | iManufacturer | 1 | 02h | |
| 15 | iProduct | 1 | 03h | "USB2.0 UVC PC Camera" |
| 16 | iSerialNumber | 1 | 00h | |
| 17 | bNumConfigurations | 1 | 01h |
Configuration Descriptor 1 Bus Powered, 200 mA
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 09h | |
| 1 | bDescriptorType | 1 | 02h | Configuration |
| 2 | wTotalLength | 2 | 01A9h | |
| 4 | bNumInterfaces | 1 | 02h | |
| 5 | bConfigurationValue | 1 | 01h | |
| 6 | iConfiguration | 1 | 00h | |
| 7 | bmAttributes | 1 | 80h | Bus Powered |
| 4..0: Reserved | ...00000 | |||
| 5: Remote Wakeup | ..0..... | No | ||
| 6: Self Powered | .0...... | No, Bus Powered | ||
| 7: Reserved (set to one) (bus-powered for 1.0) |
1....... | |||
| 8 | bMaxPower | 1 | 64h | 200 mA |
Interface Association Descriptor Video Interface Collection
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 08h | |
| 1 | bDescriptorType | 1 | 0Bh | Interface Association |
| 2 | bFirstInterface | 1 | 00h | |
| 3 | bInterfaceCount | 1 | 02h | |
| 4 | bFunctionClass | 1 | 0Eh | Video |
| 5 | bFunctionSubClass | 1 | 03h | Video Interface Collection |
| 6 | bFunctionProtocol | 1 | 00h | |
| 7 | iFunction | 1 | 01h |
Interface Descriptor 0/0 Video, 1 Endpoint
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 09h | |
| 1 | bDescriptorType | 1 | 04h | Interface |
| 2 | bInterfaceNumber | 1 | 00h | |
| 3 | bAlternateSetting | 1 | 00h | |
| 4 | bNumEndpoints | 1 | 01h | |
| 5 | bInterfaceClass | 1 | 0Eh | Video |
| 6 | bInterfaceSubClass | 1 | 01h | Video Control |
| 7 | bInterfaceProtocol | 1 | 00h | |
| 8 | iInterface | 1 | 01h |
Video Control Interface Header Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 0Dh | |
| 1 | bDescriptorType | 1 | 24h | Video Control Interface Header |
| 2 | 11 | 01 00 01 69 00 00 87 93 03 01 01 |
===>Class-Specific Video Control Interface Header Descriptor<===
bLength: 0x0D
bDescriptorType: 0x24
bDescriptorSubtype: 0x01
bcdVDC: 0x0100
wTotalLength: 0x0069 -> Validated
dwClockFrequency: 0x03938700 = () Hz
bInCollection: 0x01
baInterfaceNr[]: 0x01
Video Control Output Terminal Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 09h | |
| 1 | bDescriptorType | 1 | 24h | Video Control Output Terminal |
| 2 | 7 | 03 04 01 01 00 02 00 |
===>Video Control Output Terminal Descriptor<===
bLength: 0x09
bDescriptorType: 0x24
bDescriptorSubtype: 0x03
bTerminalID: 0x04
wTerminalType: 0x0101 = (TT_STREAMING)
bAssocTerminal: 0x00
bSourceID: 0x02
iTerminal: 0x00
Video Control Extension Unit Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Bh | |
| 1 | bDescriptorType | 1 | 24h | Video Control Extension Unit |
| 2 | 25 | 06 02 0B 36 5D 5E 5F E4 81 45 9B 0B 37 46 69 BA 05 D4 10 01 05 02 FF 00 00 |
===>Video Control Extension Unit Descriptor<===
bLength: 0x1B
bDescriptorType: 0x24
bDescriptorSubtype: 0x06
bUnitID: 0x02
guidExtensionCode: {5E5D360B-E45F--9B0B-374669BA05D4}
bNumControls: 0x10
bNrInPins: 0x01
===>List of Connected Units and Terminal ID's
baSourceID[]: 0x05
bControlSize: 0x02
bmControls : 0xFF 0x00
D00 = yes - Vendor-Specific (Optional)
D01 = yes - Vendor-Specific (Optional)
D02 = yes - Vendor-Specific (Optional)
D03 = yes - Vendor-Specific (Optional)
D04 = yes - Vendor-Specific (Optional)
D05 = yes - Vendor-Specific (Optional)
D06 = yes - Vendor-Specific (Optional)
D07 = yes - Vendor-Specific (Optional)
D08 = no - Vendor-Specific (Optional)
D09 = no - Vendor-Specific (Optional)
D10 = no - Vendor-Specific (Optional)
D11 = no - Vendor-Specific (Optional)
D12 = no - Vendor-Specific (Optional)
D13 = no - Vendor-Specific (Optional)
D14 = no - Vendor-Specific (Optional)
D15 = no - Vendor-Specific (Optional)
iExtension: 0x00
Video Control Extension Unit Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Bh | |
| 1 | bDescriptorType | 1 | 24h | Video Control Extension Unit |
| 2 | 25 | 06 05 03 DF DA EC E3 8F 27 4D 89 3B A1 8D 25 AE EE 09 10 01 03 02 FF 03 00 |
===>Video Control Extension Unit Descriptor<===
bLength: 0x1B
bDescriptorType: 0x24
bDescriptorSubtype: 0x06
bUnitID: 0x05
guidExtensionCode: {ECDADF03-8FE3-4D27-893B-A18D25AEEE09}
bNumControls: 0x10
bNrInPins: 0x01
===>List of Connected Units and Terminal ID's
baSourceID[]: 0x03
bControlSize: 0x02
bmControls : 0xFF 0x03
D00 = yes - Vendor-Specific (Optional)
D01 = yes - Vendor-Specific (Optional)
D02 = yes - Vendor-Specific (Optional)
D03 = yes - Vendor-Specific (Optional)
D04 = yes - Vendor-Specific (Optional)
D05 = yes - Vendor-Specific (Optional)
D06 = yes - Vendor-Specific (Optional)
D07 = yes - Vendor-Specific (Optional)
D08 = yes - Vendor-Specific (Optional)
D09 = yes - Vendor-Specific (Optional)
D10 = no - Vendor-Specific (Optional)
D11 = no - Vendor-Specific (Optional)
D12 = no - Vendor-Specific (Optional)
D13 = no - Vendor-Specific (Optional)
D14 = no - Vendor-Specific (Optional)
D15 = no - Vendor-Specific (Optional)
iExtension: 0x00
Video Control Input Terminal Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 12h | |
| 1 | bDescriptorType | 1 | 24h | Video Control Input Terminal |
| 2 | 16 | 02 01 01 02 00 00 00 00 00 00 00 00 03 00 00 00 |
===>Video Control Input Terminal Descriptor<===
bLength: 0x12
bDescriptorType: 0x24
bDescriptorSubtype: 0x02
bTerminalID: 0x01
wTerminalType: 0x0201 = (ITT_CAMERA)
bAssocTerminal: 0x00
iTerminal: 0x00
===>Camera Input Terminal Data
wObjectiveFocalLengthMin: 0x0000
wObjectiveFocalLengthMax: 0x0000
wOcularFocalLength: 0x0000
bControlSize: 0x03
bmControls : 0x00 0x00 0x00
D00 = no - Scanning Mode
D01 = no - Auto-Exposure Mode
D02 = no - Auto-Exposure Priority
D03 = no - Exposure Time (Absolute)
D04 = no - Exposure Time (Relative)
D05 = no - Focus (Absolute)
D06 = no - Focus (Relative)
D07 = no - Iris (Absolute)
D08 = no - Iris (Relative)
D09 = no - Zoom (Absolute)
D10 = no - Zoom (Relative)
D11 = no - Pan (Absolute)
D12 = no - Pan (Relative)
D13 = no - Roll (Absolute)
D14 = no - Roll (Relative)
D15 = no - Tilt (Absolute)
D16 = no - Tilt (Relative)
D17 = no - Focus Auto
D18 = no - Reserved
D19 = no - Reserved
D20 = no - Reserved
D21 = no - Reserved
D22 = no - Reserved
D23 = no - Reserved
Video Control Processing Unit Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 0Bh | |
| 1 | bDescriptorType | 1 | 24h | Video Control Processing Unit |
| 2 | 9 | 05 03 01 00 00 02 7F 17 00 |
===>Video Control Processing Unit Descriptor<===
bLength: 0x0B
bDescriptorType: 0x24
bDescriptorSubtype: 0x05
bUnitID: 0x03
bSourceID: 0x01
wMaxMultiplier: 0x0000
bControlSize: 0x02
bmControls : 0x7F 0x17
D00 = yes - Brightness
D01 = yes - Contrast
D02 = yes - Hue
D03 = yes - Saturation
D04 = yes - Sharpness
D05 = yes - Gamma
D06 = yes - White Balance Temperature
D07 = no - White Balance Component
D08 = yes - Backlight Compensation
D09 = yes - Gain
D10 = yes - Power Line Frequency
D11 = no - Hue, Auto
D12 = yes - White Balance Temperature, Auto
D13 = no - White Balance Component, Auto
D14 = no - Digital Multiplier
D15 = no - Digital Multiplier Limit
iProcessing: 0x00
Endpoint Descriptor 83 3 In, Interrupt, 4 ms
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 07h | |
| 1 | bDescriptorType | 1 | 05h | Endpoint |
| 2 | bEndpointAddress | 1 | 83h | 3 In |
| 3 | bmAttributes | 1 | 03h | Interrupt |
| 1..0: Transfer Type | ......11 | Interrupt | ||
| 7..2: Reserved | 000000.. | |||
| 4 | wMaxPacketSize | 2 | 0017h | 23 bytes |
| 6 | bInterval | 1 | 06h | 4 ms |
Video Control Interrupt Endpoint Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 05h | |
| 1 | bDescriptorType | 1 | 25h | Video Control Interrupt Endpoint |
| 2 | 3 | 03 17 00 |
===>Class-specific VC Interrupt Endpoint Descriptor<===
bLength: 0x05
bDescriptorType: 0x25
bDescriptorSubType: 0x03
wMaxTransferSize: 0x0017 = () Bytes
Interface Descriptor 1/0 Video, 0 Endpoints
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 09h | |
| 1 | bDescriptorType | 1 | 04h | Interface |
| 2 | bInterfaceNumber | 1 | 01h | |
| 3 | bAlternateSetting | 1 | 00h | |
| 4 | bNumEndpoints | 1 | 00h | |
| 5 | bInterfaceClass | 1 | 0Eh | Video |
| 6 | bInterfaceSubClass | 1 | 02h | Video Streaming |
| 7 | bInterfaceProtocol | 1 | 00h | |
| 8 | iInterface | 1 | 00h |
Video Streaming Interface Input Header Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 0Eh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Interface Input Header |
| 2 | 12 | 01 01 01 01 81 00 04 02 01 01 01 00 |
===>Video Class-Specific VS Video Input Header Descriptor<===
bLength: 0x0E
bDescriptorType: 0x24
bDescriptorSubtype: 0x01
bNumFormats: 0x01
wTotalLength: 0x0101 -> Validated
bEndpointAddress: 0x81 -> Direction: IN - EndpointID:
bmInfo: 0x00 -> Dynamic Format Change not Supported
bTerminalLink: 0x04
bStillCaptureMethod: 0x02 -> Still Capture Method
bTriggerSupport: 0x01 -> Hardware Triggering Support
bTriggerUsage: 0x01 -> Host will notify client application of button event
bControlSize: 0x01
Video Payload Format 0x00
D00 = no - Key Frame Rate
D01 = no - P Frame Rate
D02 = no - Compression Quality
D03 = no - Compression Window Size
D04 = no - Generate Key Frame
D05 = no - Update Frame Segment
D06 = no - Reserved
D07 = no - Reserved
Video Streaming Uncompressed Video Format Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Bh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Uncompressed Video Format |
| 2 | 25 | 04 01 06 59 55 59 32 00 00 10 00 80 00 00 AA 00 38 9B 71 10 01 00 00 00 00 |
===>Video Streaming Uncompressed Format Type Descriptor<===
bLength: 0x1B
bDescriptorType: 0x24
bDescriptorSubtype: 0x04
bFormatIndex: 0x01
bNumFrameDescriptors: 0x06
guidFormat: {----00AA00389B71} = YUY2 Format
bBitsPerPixel: 0x10
bDefaultFrameIndex: 0x01
bAspectRatioX: 0x00
bAspectRatioY: 0x00
bmInterlaceFlags: 0x00
D0 = 0x00 Interlaced stream or variable: No
D1 = 0x00 Fields per frame: fields
D2 = 0x00 Field first: No
D3 = 0x00 Reserved
D4.. = 0x00 Field patterns -> Field only
D6.. = 0x00 Display Mode -> Bob only
bCopyProtect: 0x00 -> Duplication Unrestricted
补充一下关于Layout of a GUID Data Structure
Therefore, for a GUID defined as {32595559-0000-0010-8000-00AA00389B71}, as described
in the table above, the little-endian byte-stream representation would be:
0x59, 0x55, 0x59, 0x32, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xAA, 0x00, 0x38, 0x9B, 0x71
Video Streaming Uncompressed Video Frame Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Eh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Uncompressed Video Frame |
| 2 | 28 | 05 01 00 80 02 E0 01 00 60 EA 00 00 60 EA 00 00 60 09 00 80 1A 06 00 01 80 1A 06 00 |
===>Video Streaming Uncompressed Frame Type Descriptor<===
bLength: 0x1E
bDescriptorType: 0x24
bDescriptorSubtype: 0x05
bFrameIndex: 0x01
bmCapabilities: 0x00
wWidth: 0x0280
wHeight: 0x01E0
dwMinBitRate: 0x00EA6000
dwMaxBitRate: 0x00EA6000
dwMaxVideoFrameBufferSize: 0x00096000
dwDefaultFrameInterval: 0x00061A80
bFrameIntervalType: 0x01
===>Additional Discrete Frame Type Data
dwFrameInterval[]: 0x00061A80
Video Streaming Uncompressed Video Frame Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Eh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Uncompressed Video Frame |
| 2 | 28 | 05 02 00 A0 00 78 00 00 A6 0E 00 00 A6 0E 00 00 96 00 00 80 1A 06 00 01 80 1A 06 00 |
===>Video Streaming Uncompressed Frame Type Descriptor<===
bLength: 0x1E
bDescriptorType: 0x24
bDescriptorSubtype: 0x05
bFrameIndex: 0x02
bmCapabilities: 0x00
wWidth: 0x00A0
wHeight: 0x0078
dwMinBitRate: 0x000EA600
dwMaxBitRate: 0x000EA600
dwMaxVideoFrameBufferSize: 0x00009600
dwDefaultFrameInterval: 0x00061A80
bFrameIntervalType: 0x01
===>Additional Discrete Frame Type Data
dwFrameInterval[]: 0x00061A80
Video Streaming Uncompressed Video Frame Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Eh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Uncompressed Video Frame |
| 2 | 28 | 05 03 00 B0 00 90 00 00 56 13 00 00 56 13 00 00 C6 00 00 80 1A 06 00 01 80 1A 06 00 |
===>Video Streaming Uncompressed Frame Type Descriptor<===
bLength: 0x1E
bDescriptorType: 0x24
bDescriptorSubtype: 0x05
bFrameIndex: 0x03
bmCapabilities: 0x00
wWidth: 0x00B0
wHeight: 0x0090
dwMinBitRate: 0x00135600
dwMaxBitRate: 0x00135600
dwMaxVideoFrameBufferSize: 0x0000C600
dwDefaultFrameInterval: 0x00061A80
bFrameIntervalType: 0x01
===>Additional Discrete Frame Type Data
dwFrameInterval[]: 0x00061A80
Video Streaming Uncompressed Video Frame Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Eh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Uncompressed Video Frame |
| 2 | 28 | 05 04 00 40 01 F0 00 00 98 3A 00 00 98 3A 00 00 58 02 00 80 1A 06 00 01 80 1A 06 00 |
===>Video Streaming Uncompressed Frame Type Descriptor<===
bLength: 0x1E
bDescriptorType: 0x24
bDescriptorSubtype: 0x05
bFrameIndex: 0x04
bmCapabilities: 0x00
wWidth: 0x0140
wHeight: 0x00F0
dwMinBitRate: 0x003A9800
dwMaxBitRate: 0x003A9800
dwMaxVideoFrameBufferSize: 0x00025800
dwDefaultFrameInterval: 0x00061A80
bFrameIntervalType: 0x01
===>Additional Discrete Frame Type Data
dwFrameInterval[]: 0x00061A80
Video Streaming Uncompressed Video Frame Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Eh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Uncompressed Video Frame |
| 2 | 28 | 05 05 00 60 01 20 01 00 58 4D 00 00 58 4D 00 00 18 03 00 80 1A 06 00 01 80 1A 06 00 |
===>Video Streaming Uncompressed Frame Type Descriptor<===
bLength: 0x1E
bDescriptorType: 0x24
bDescriptorSubtype: 0x05
bFrameIndex: 0x05
bmCapabilities: 0x00
wWidth: 0x0160
wHeight: 0x0120
dwMinBitRate: 0x004D5800
dwMaxBitRate: 0x004D5800
dwMaxVideoFrameBufferSize: 0x00031800
dwDefaultFrameInterval: 0x00061A80
bFrameIntervalType: 0x01
===>Additional Discrete Frame Type Data
dwFrameInterval[]: 0x00061A80
Video Streaming Uncompressed Video Frame Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Eh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Uncompressed Video Frame |
| 2 | 28 | 05 06 00 80 02 E0 01 00 60 EA 00 00 60 EA 00 00 60 09 00 80 1A 06 00 01 80 1A 06 00 |
===>Video Streaming Uncompressed Frame Type Descriptor<===
bLength: 0x1E
bDescriptorType: 0x24
bDescriptorSubtype: 0x05
bFrameIndex: 0x06
bmCapabilities: 0x00
wWidth: 0x0280
wHeight: 0x01E0
dwMinBitRate: 0x00EA6000
dwMaxBitRate: 0x00EA6000
dwMaxVideoFrameBufferSize: 0x00096000
dwDefaultFrameInterval: 0x00061A80
bFrameIntervalType: 0x01
===>Additional Discrete Frame Type Data
dwFrameInterval[]: 0x00061A80
Video Streaming Still Image Frame Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 1Eh | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Still Image Frame |
| 2 | 28 | 03 00 06 80 02 E0 01 A0 00 78 00 B0 00 90 00 40 01 F0 00 60 01 20 01 80 02 E0 01 00 |
===>Still Image Frame Type Descriptor<===
bLength: 0x1E
bDescriptorType: 0x24
bDescriptorSubtype: 0x03
bEndpointAddress: 0x00
bNumImageSizePatterns: 0x06
wWidth[]: 0x0280
wHeight[]: 0x01E0
wWidth[]: 0x00A0
wHeight[]: 0x0078
wWidth[]: 0x00B0
wHeight[]: 0x0090
wWidth[]: 0x0140
wHeight[]: 0x00F0
wWidth[]: 0x0160
wHeight[]: 0x0120
wWidth[]: 0x0280
wHeight[]: 0x01E0
bNumCompressionPattern: 0x00
Video Streaming Color Matching Descriptor
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 06h | |
| 1 | bDescriptorType | 1 | 24h | Video Streaming Color Matching |
| 2 | 4 | 0D 01 01 04 |
===>Color Matching Descriptor<===
bLength: 0x06
bDescriptorType: 0x24
bDescriptorSubtype: 0x0D
bColorPrimaries: 0x01
bTransferCharacteristics: 0x01
bMatrixCoefficients: 0x04
Interface Descriptor 1/1 Video, 1 Endpoint
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 09h | |
| 1 | bDescriptorType | 1 | 04h | Interface |
| 2 | bInterfaceNumber | 1 | 01h | |
| 3 | bAlternateSetting | 1 | 01h | |
| 4 | bNumEndpoints | 1 | 01h | |
| 5 | bInterfaceClass | 1 | 0Eh | Video |
| 6 | bInterfaceSubClass | 1 | 02h | Video Streaming |
| 7 | bInterfaceProtocol | 1 | 00h | |
| 8 | iInterface | 1 | 00h |
Endpoint Descriptor 81 1 In, Isochronous, 125 us
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | 07h | |
| 1 | bDescriptorType | 1 | 05h | Endpoint |
| 2 | bEndpointAddress | 1 | 81h | 1 In |
| 3 | bmAttributes | 1 | 05h | Isochronous, Asynchronous, Data |
| 1..0: Transfer Type | ......01 | Isochronous | ||
| 3..2: Sync Type | ....01.. | Asynchronous | ||
| 5..4: Usage Type | ..00.... | Data | ||
| 7..6: Reserved | 00...... | |||
| 4 | wMaxPacketSize | 2 | 1400h | 1024 bytes, 2 additional transactions (3 per microframe) |
| 6 | bInterval | 1 | 01h | 125 us |