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USB3803 데이터시트(PDF) 48 Page - Microchip Technology

부품명 USB3803
상세설명  USB 2.0 High-Speed Hub Controller Optimized
PDF  99 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB3803 데이터시트(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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