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USB2512AI Datenblatt(PDF) 39 Page - Microchip Technology

Teilenummer USB2512AI
Bauteilbeschribung  USB 2.0 Hi-Speed Hub Controller
PDF  63 Pages
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2512AI Datenblatt(HTML) 39 Page - Microchip Technology

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USB 2.0 Hi-Speed Hub Controller
Datasheet
SMSC USB251xB/xBi
39
Revision 2.2 (02-17-12)
DATASHEET
5.1.30
Register FBh: PortMap 12
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PRTR12
PortMap Register for Ports 1 and 2: 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]
0000
Physical port 2 is disabled
0001
Physical port 2 is mapped to logical port 1
0010
Physical port 2 is mapped to logical port 2
0011
Physical port 2 is mapped to logical port 3
0100
Physical port 2 is mapped to logical port 4
1000
to
1111
rsvd, will default to 0000 value
Bit [3:0]
0000
Physical port 1 is disabled
0001
Physical port 1 is mapped to logical port 1
0010
Physical port 1 is mapped to logical port 2
0011
Physical port 1 is mapped to logical port 3
0100
Physical port 1 is mapped to logical port 4
1000
to
1111
rsvd, will default to 0000 value



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