MC141555 Motorola, MC141555 Datasheet - Page 10

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

STATUS CHANGE REGISTER
Register, as shown in following table. This register contains only one byte.
REQUEST
If the Hub responses with STALL packet, it means the request is not supported.
MC141555
10
Table 7. Status Change Register
The additional endpoint 1 of the Hub Controller supports interrupt transfer which reports the Hub and Port Status Change
The Hub Controller will respond to the HOST Request through the endpoint 0 pipe in the way as illustrated in following tables.
Offset
7
8
Bit
0
1
2
3
4
5
6-7
Function
Hub status change
Port 1 status change
Port 2 status change
Port 3 status change
Port 4 status change
Port 5 status change
Reserved
Field
DeviceRemovable
PortPwrCtrlMask
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Size
1
1
Value
0
1
0
1
0
1
0
1
0
1
0
1
00
Value
00h/20h
3Eh/
1Eh/
00h
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Description
No status change in Hub
Hub status change detected
No status change in Port 1
Port 1 status change detected
No status change in Port 2
Port 2 status change detected
No status change in Port 3
Port 3 status change detected
No status change in Port 4
Port 4 status change detected
No status change in Port 5
Port 5 status change detected
Default values
Description
00h: Indicate all the ports connected to this Hub are
removable.
02h: Indicate Port5 is dedicated to internal use and
permanent attached.
Indicates all the ports connected to this Hub are not
affected by a Ganged-mode power request, Ports
always require SetPortFeature (PORT_POWER) to
control the port’ s power state.
3Eh: 5 downstream ports are individual-controlled
1Eh: 4 downstream ports are individual-controlled
00h: all downstream ports are ganged-controlled
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