USB3803 Datasheet, PDF (54/99 Pages) Microchip Technology – USB 2.0 High-Speed Hub Controller Optimized

USB3803
TABLE 7-11: INTERFACE DESCRIPTOR (HIGH-SPEED, SINGLE-TT) (CONTINUED)
Offset
7
8
Field
InterfaceProtocol
Interface
Size
1
1
Value
xxh
00h
Description
Protocol
xx = 00h if bNumInterfaces = 01h (Single-TT).
xx = 01h if bNumInterfaces = 02h (Multi-TT).
Index of the string descriptor describing this interface
(strings not supported).
7.3.8 ENDPOINT DESCRIPTOR (SINGLE-TT)
The following table provides the endpoint descriptor values for Single-TT operation.
TABLE 7-12: ENDPOINT DESCRIPTOR (FOR STATUS CHANGE ENDPOINT, SINGLE-TT)
Offset
0
1
2
3
4
6
Field
Length
DescriptorType
EndpointAddress
Attributes
MaxPacketSize
Interval
Size
1
1
1
1
2
1
Value
07h
05h
81h
03h
0001h
0Ch
Description
Size of this Descriptor.
Endpoint Descriptor Type.
The address of the endpoint on the USB Device.
Describes the endpoint’s attributes (interrupt only, no
synchronization, data endpoint).
Maximum packet size for this endpoint.
Interval for polling endpoint for data transfers (Maximum
Possible).
7.3.9 INTERFACE DESCRIPTOR (MULTI-TT)
The following table provides interface descriptor values for High-Speed, Multi-TT operation.
Note: This is only available if Multi-TT is reported in the other Other-Speed Configuration Descriptor.
TABLE 7-13: INTERFACE DESCRIPTOR (HIGH-SPEED, MULTI-TT)
Offset
0
1
2
3
4
5
6
7
8
Field
Length
DescriptorType
InterfaceNumber
AlternateSetting
NumEndpoints
InterfaceClass
InterfaceSubclass
InterfaceProtocol
Interface
Size
1
1
1
1
1
1
1
1
1
Value
09h
04h
00h
01h
01h
09h
00h
02h
00h
Description
Size of this Descriptor.
Interface Descriptor Type.
Number of this interface.
Value used to select this alternate setting for the inter-
face.
Number of endpoints used by this interface (not includ-
ing endpoint 0).
Hub class code.
Subclass code.
Protocol code.
Index of the string descriptor describing this interface
(strings not supported)
DS00001691B-page 54
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