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USB20H04-JD bảng dữ liệu(PDF) 31 Page - SMSC Corporation

tên linh kiện USB20H04-JD
Giải thích chi tiết về linh kiện  4-PORT USB 2.0 HUB CONTROLLER
PDF  35 Pages
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nhà sản xuất  SMSC [SMSC Corporation]
Trang chủ  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB20H04-JD bảng dữ liệu(HTML) 31 Page - SMSC Corporation

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4-Port USB 2.0 Controller
Datasheet
SMSC USB20H04
Page 31
Revision 1.63 (03-30-07)
DATASHEET
Table 9.7 - Interface Descriptor (present if multiple-TT)
OFFSET
HIGH
SPEED
FIELD NAME
DESCRIPTION
0
09h
bLength
Size of this descriptor in bytes
1
04h
bDescriptorType
INTERFACE Descriptor Type
2
00h
bInterfaceNumber
Number of this interface
3
01h
bAlternateSetting
Value used to select this alternate setting for
the interface
4
01h
bNumEndpoints
Number of endpoints used by this interface (not
including endpoint 0)
5
09h
bInterfaceClass
Class code assigned by USB for Hubs
6
00h
bInterfaceSubClass
Subclass code assigned by USB
7
02h
bInterfaceProtcol
Protocol code assigned by USB
8
00h
bInterface
Index of string descriptor describing this
configuration (string not supported)
Table 9.8 - On-The-GO (OTG) Descriptor
OFFSET
FULL
SPEED
HIGH SPEED
FIELD NAME
DESCRIPTION
0
03h
03h
bLength
Size of this descriptor in bytes
1
09h
09h
bDescriptorType
OTG Descriptor Type
Attribute Fields:
D[7:2] = Reserved
D1: HNP Support (not supported)
2
01h
01h
wMaxPacketSize
D0: SRP Support.
Table 9.9 - Class-Specific Hub Descriptor (Full-Speed and High-Speed)
OFFSET
FIELD NAME
VALUE
DESCRIPTION
0
Length
09h
Size of this Descriptor.
1
Descriptor Type
29h
Hub Descriptor Type.
2
NbrPorts
user
Number of downstream facing ports this Hub
supports. Derived from OEM value defined in
EEPROM or SMBus load. See Section 11.23.2.1 in
the USB Specification.
Note: If Dynamic Power is enabled, and the
SELF_PWR pin is low (indicating Bus Power
Operation), then ports 3 & 4 are not available and
either a value of 1 is reported if the OEM value is 1
or a value of 2 is reported if the OEM value is 2, 3
or 4.
3,4
HubCharacteristics
user
Defines several characteristics that are derived
from OEM values. Also defines TT Think Time
(fixed at a value of 00b for 8FS bit times max).
5
PwrOn2PwrGood
user
Time (in 2 ms intervals) from the time the power-on
sequence begins on a port until power is good on
that port. Derived from OEM value.



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