USB2513B-AEZC View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'USB2513B-AEZC' PDF : 63 Pages View PDF
USB 2.0 Hi-Speed Hub Controller
Datasheet
5.1.31 Register FCh: PortMap 34
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PRTR34
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 32) 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
Revision 2.2 (02-17-12)
40
DATASHEET
SMSC USB251xB/xBi
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