USB 2.0
Datasheet |
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8.2.1.34 | Register FEh: PortMap 7 | |
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NUMBER | BIT NAME | DESCRIPTION |
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7:0 | PRTR7 | PortMap register for port 7. |
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| When a hub is enumerated by a USB host controller, the hub is only |
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| permitted to report how many ports it has; the hub is not permitted to select |
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| a numerical range or assignment. The host controller will number the |
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| downstream ports of the hub starting with the number '1', up to the number |
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| of ports that the hub reported having. |
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| The host's port number is referred to as "Logical Port Number" and the |
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| physical port on the hub is the “Physical Port Number". When mapping mode |
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| is enabled (see PRTMAP_EN in Register 08h: Configuration Data Byte 3) |
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| the hub's downstream port numbers can be mapped to different logical port |
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| numbers (assigned by the host). |
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| Note: OEM must ensure that contiguous logical port numbers are used, |
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| starting from #1 up to the maximum number of enabled ports; this |
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| ensures that the hub's ports are numbered in accordance with the |
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| way a host will communicate with the ports. |
Table 8.6 PortMap Register for Port 7
Bit [7:4] | ‘0000’ | Reserved |
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| ‘1111’ |
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Bit [3:0] | ‘0000’ | Physical Port 7 is Disabled |
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| ‘0001’ | Physical Port 7 is mapped to Logical Port 1 |
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| ‘0010’ | Physical Port 7 is mapped to Logical Port 2 |
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| ‘0011’ | Physical Port 7 is mapped to Logical Port 3 |
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| ‘0100’ | Physical Port 7 is mapped to Logical Port 4 |
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| ‘0101’ | Physical Port 7 is mapped to Logical Port 5 |
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| ‘0110’ | Physical Port 7 is mapped to Logical Port 6 |
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| ‘0111’ | Physical Port 7 is mapped to Logical Port 7 |
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| ‘1000’ | Reserved, will default to ‘0000’ value |
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| ‘1111’ |
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SMSC USB251x | 51 | Revision 1.0 |
DATASHEET