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USB3803 bảng dữ liệu(PDF) 48 Page - Microchip Technology

tên linh kiện USB3803
Giải thích chi tiết về linh kiện  USB 2.0 High-Speed Hub Controller Optimized
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nhà sản xuất  MICROCHIP [Microchip Technology]
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USB3803 bảng dữ liệu(HTML) 48 Page - Microchip Technology

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USB3803
DS00001691B-page 48
 2014-2015 Microchip Technology Inc.
7.2.3
INTERFACE DESCRIPTOR (FULL-SPEED)
The following table provides the interface descriptor values for Full-Speed operation.
8
MaxPower
1
user
Maximum Power Consumption of the Hub from VBUS
when fully operational. This value includes all support
circuitry associated with the hub (including an attached
“embedded” peripheral if hub is part of a compound
device), and is in 2mA increments. The Hub supports
Self-Powered and Bus-Powered operation. The SELF-
_BUS_PWR bit (CONFIG_BYTE_1) is used to deter-
mine which of the values below are reported. The value
reported to the host must coincide with the current oper-
ating mode, and will be determined by the following
rules.
The value that is reported to the host will be:
‘MAX_PWR_BP’ if SELF_BUS_PWR = ‘0’
‘MAX_PWR_SP’ if SELF_BUS_PWR = ‘1’
In all cases the reported value is sourced from the MAX
POWER data field (for Self or Bus power) that was
loaded by Internal Default, or serial port configuration.
TABLE 7-3:
INTERFACE DESCRIPTOR (FULL-SPEED)
Offset
Field
Size
Value
Description
0
Length
1
09h
Size of this Descriptor
1
DescriptorType
1
04h
Interface Descriptor Type
2
InterfaceNumber
1
00h
Number of this interface.
3
AlternateSetting
1
00h
Value used to select this alternate setting for the inter-
face.
4
NumEndpoints
1
01h
Number of endpoints used by this interface (not includ-
ing endpoint 0).
5
InterfaceClass
1
09h
Hub class code.
6
InterfaceSubclass
1
00h
Subclass code
7
InterfaceProtocol
1
00h
Protocol code.
8
Interface
1
00h
Index of the string descriptor describing this interface
(strings not supported).
TABLE 7-2:
CONFIGURATION DESCRIPTOR (FULL-SPEED) (CONTINUED)
Offset
Field
Size
Value
Description



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