參數(shù)資料
型號： UPD72012CU
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
文件頁數(shù)： 17/36頁
文件大?。?/td> 414K
代理商： UPD72012CU
Data Sheet S13918EJ3V0DS
17
μ
PD72012
2.4 Standard Endpoint Descriptor 1
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 standard endpoint
descriptor 1.
0x07
0x07
0x07
1
bDescriptorType
1
Shows that this is a standard endpoint descriptor.
0x05
0x05
0x05
2
bEndpointAddress
1
Shows the EndpointAddress of endpoint 1.
0x81
0x81
0x81
3
bmAttributes
1
Shows the attributes of endpoint 1
(Interrupt=“0x03”).
0x03
0x03
0x03
4
wMaxPacketSize
2
Shows the maximum packet size of endpoint 1.
0x0001
0x0001
0x0001
6
bInterval
1
For an Interrupt attribute endpoint, shows the polling
time in milliseconds using hexadecimal notation. For
a HUB, the maximum value that can be set (“0xFF”)
is entered.
0xFF
0xFF
0xFF
2.5 HUB Class Descriptor
(1/4)
Value
Standard ROM code
product
No.
Field
Size
(Bytes)
Contents
003
004
Mask
ROM code
product
0
bDescLength
1
Shows the size in bytes of the HUB class descriptor.
0x09
0x09
0x09
1
bDescriptorType
1
Shows that this is a HUB class descriptor.
0x29
0x29
0x29
2
bNbrPort
1
Shows the number of downstream ports the HUB
supports in a set.
For a standard ROM code product (003, 004), the
value varies according to the PVSEL pin setting.
It is “0x05” for a 5-port HUB (PVSEL=“H”), and
“0x04” for a 4-port HUB (PVSEL=“L”).
For a Mask ROM code product, the value in this field
can be set arbitrarily. Since two-way setting by
switching the PVSEL input level is possible for these
values, perform two-way specification. Note that the
values that are set for PVSEL=“H” are from “0x01” to
“0x05”, and the values that are set for PVSEL=“L”
are from “0x01” to “0x04”. The
μ
PD72012 enables
ports in turn starting from the smallest port number.
0x04
(PVSEL=“L”)
or
0x05
(PVSEL=“H”)
0x04
(PVSEL=“L”)
or
0x05
(PVSEL=“H”)
0xXX
(PVSEL=“L”)
or
0xYY
(PVSEL=“H”)
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