SMSC USB464, USB4640i 8.4.4.22F3h: Port Map, 8.4.4.23F4h-F6h:Reserved, BIT, BYTE, Note:, BYTE NAME, BYTE NAME, DATASHEET, DESCRIPTION, DESCRIPTION

High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller

Datasheet

8.4.4.22F3h: Port Map 3

BIT	BYTE NAME	DESCRIPTION
7:0	PRTM3	PortMap register for port 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 Register 08h: Configuration Data
		Byte 3) the hub's downstream port numbers can be remapped to different
		logical port numbers (assigned by the host).
		Note: The OEM must ensure that contiguous logical port numbers are
		used, 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.

Table 8.6 Port Map Register for Port 3

Bit [7:4]	‘0000’	Reserved
	‘0001’	Reserved
	‘0010’	Reserved
	‘0011’	Reserved
	‘0100’	Illegal; Do not use
	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’	Illegal; Do not use
	to
	‘1111’

8.4.4.23F4h-F6h: Reserved

BYTE	BYTE NAME	DESCRIPTION
6:0	Reserved	Reserved.

SMSC USB4640/USB4640i 49 Revision 1.0 (06-01-09)

DATASHEET