USB3503 Datasheet, PDF (43/82 Pages) SMSC Corporation – USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications
Datasheet
5.3.39
Register FCh: Port Remap 34 - PRTR34
Default = 0x03h - Physical port is mapped to corresponding logical port.
BIT NUMBER
7:0
BIT NAME
PRTR34
DESCRIPTION
Port remap register for ports 3.
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
reported having.
The host’s port number is referred to as “Logical Port Number” and the physical
port on the hub is the Physical Port Number”. When remapping mode is enabled
(see PRTMAP_EN in Section 5.3.9) the hub’s downstream port numbers can be
remapped to different logical port numbers (assigned by the host).
Note: the customer must ensure that Contiguous Logical Port Numbers are
used, starting from #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’ Reserved – software must not write ‘1’ to any of these bits.
‘0001’ Reserved, will default to ‘0000’ value
to
‘1111’
Bit [3:0] = ‘0000’ Physical Port 3 is Disabled
‘0001’ Physical Port 3 is mapped to Logical Port 1
‘0010’ Physical Port 3 is mapped to Logical Port 2
‘0011’ Physical Port 3 is mapped to Logical Port 3
‘0100’ Reserved, will default to ‘0000’ value Physical Port 3 is
mapped to Logical Port 4
‘0101’ Reserved, will default to ‘0000’ value
to
‘1111’
SMSC USB3503A
43
DATASHEET
Revision 1.1 (02-07-13)