USB2512BI/M2 View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'USB2512BI/M2' PDF : 57 Pages View PDF
USB251xB/xBi
5.1.31 REGISTER FCH: PORTMAP 34
Bit Number
7:0
Bit Name
PRTR34
Description
PortMap Register for Ports 3 and 4: When a hub is enumerated by a USB
host controller, the hub is only permitted to report how many ports it has; the
hub is not permitted to select a numerical range or assignment. The host
controller will number the downstream ports of the hub starting with the
number 1, up to the number of ports that the hub reports having.
The host's port number is called the Logical Port Number and the physical
port on the hub is the Physical Port Number. When mapping mode is enabled
(see PRTMAP_EN, Section 5.1.9 on page 23) the hub's downstream port
numbers can be mapped to different logical port numbers (assigned by the
host).
Note:
Contiguous logical port numbers must be implemented, starting from
number 1 up to the maximum number of enabled ports. This ensures
that the hub's ports are numbered in accordance with the way a host
will communicate with the ports.
Bit [7:4]
Bit [3:0]
0000
0001
0010
0011
0100
1000
to
1111
0000
0001
0010
0011
0100
1000
to
1111
Physical port 4 is disabled
Physical port 4 is mapped to logical port 1
Physical port 4 is mapped to logical port 2
Physical port 4 is mapped to logical port 3
Physical port 4 is mapped to logical port 4
rsvd, will default to 0000 value
Physical port 3 is disabled
Physical port 3 is mapped to logical port 1
Physical port 3 is mapped to logical port 2
Physical port 3 is mapped to logical port 3
Physical port 3 is mapped to logical port 4
rsvd, will default to 0000 value
2010 - 2015 Microchip Technology Inc.
DS00001692C-page 31
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