MC141555 Motorola, MC141555 Datasheet - Page 9

• Manufacturer Part Number: MC141555
• Description: USB Hub Controller CMOS
• Manufacturer: Motorola

MOTOROLA
Table 4. Interface Descriptor
Table 5. Endpoint Descriptor
Table 6. Hub Descriptor
Offset
0
1
2
3
4
5
6
7
8
Offset
0
1
2
3
4
6
Offset
0
1
2
3
5
6
Field
bLength
bDescriptorType
bInterfaceNumber
bAlternateSetting
bNumEndpoints
bInterfaceClass
bInterfaceSubClass
bInterfaceProtocol
iInterface
Field
bLength
bDescriptorType
bEndpointAddress
bmAttributes
wMaxPacketSize
bInterval
Field
bLength
bDescriptorType
bNbrPorts
wHubCharacteristics
bPwrOn2PwrGood
bHubContrCurrent
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Size
1
1
1
1
2
1
Size
1
1
1
1
1
1
1
1
1
Size
1
1
1
2
1
1
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Value
07h
05h
81h
03h
0001h
FFh
Value
09h
04h
00h
00h
01h
09h
00h
00h
00h
Value
09h
29h
04h/05h
0000h /
0004h/
0009h/
000Dh
32h
64h
Description
No. of bytes in this descriptor = 7
Endpoint descriptor type
Endpoint No. = 1, IN endpoint
Endpoint attributes = b00000011, Transfer type = Interrupt
Max. packet size this endpoint is capable of sending = 1 byte
Interval for polling endpoint for data transfer = 255 ms
Description
No. of bytes in this descriptor = 9
Interface descriptor type
No. of Interface = 0
Alternate setting value for the interface identified in the prior field
= 0
No. of endpoints used by this interface = 1
Class code = 09 (assigned by USB)
SubClass code = 01 (assigned by USB)
Protocol code = 00 (assigned by USB)
Index of string descriptor describing this interface = 0
Description
No. of bytes in this descriptor = 9
Hub descriptor type
No. of downstream ports
Hub’ s characteristics
Power Switching Mode:
BIT1..BIT0 = 00: Ganged Power Switching
BIT1..BIT0 = 01: Individual Port Power Switching
Compound Device:
BIT2=0: Not Compound Device
BIT2=1: Compound Device
Overcurrent Protection Mode:
BIT4..BIT3=00: Global Overcurrent Protection
BIT4..BIT3=01: Individual Port Overcurrent Protection
Time from the power on to power good = 100 ms
Maximum current requirements of the Hub controller
electronics
64h: 100 mA
MC141555
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