參數(shù)資料
型號(hào)： UPD72012GB-003
廠商： NEC Corp.
英文描述： HUB CONTROLLER FOR UNIVERSAL SERIAL BUS
中文描述： 集線器控制器通用串行總線
文件頁(yè)數(shù)： 16/36頁(yè)
文件大小： 414K
代理商： UPD72012GB-003
16
Data Sheet S13918EJ3V0DS
μ
PD72012
2.3 Standard Interface Descriptor
Value
Standard ROM code
product
No.
Field
Size
(Bytes)
Contents
003
004
Mask
ROM code
product
0
bLength
1
Shows the size in bytes of the standard interface
descriptor.
0x09
0x09
0x09
1
bDescriptorType
1
Shows that this is a standard interface descriptor.
0x04
0x04
0x04
2
bInterfaceNumber
1
If there are multiple interfaces, the host specifying
this value in a Set_Interface request selects this
interface.
This is “0x00” for the
μ
PD72012.
0x00
0x00
0x00
3
bAlternateSetting
1
This value is used if there is an alternate setting of
the interface. It is “0x00” for the
μ
PD72012.
0x00
0x00
0x00
4
bNumEndpoints
1
Shows the number of endpoints defined in this
interface.
0x01
0x01
0x01
5
bIntefaceClass
1
HUB class code defined by USB
(HUB_CLASSCODE=“0x09”).
0x09
0x09
0x09
6
bInterfaceSubClass
1
HUB subclass code defined by USB.
0x00
0x00
0x00
7
bInterfaceProtocol
1
Protocol code defined by USB. Not defined in HUB
class.
0x00
0x00
0x00
8
iInteface
1
Shows the index of the string descriptor for a
comment about the interface of a product using the
HUB.
Since not used for a standard ROM code product
(003, 004), its value is “0x00”.
When using this for a Mask ROM code product, set it
to “0x05”.
0x00
0x00
0x00
or
0x05
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