USB2517 Datasheet, PDF (40/72 Pages) SMSC Corporation – USB 2.0 Hi-Speed Hub Controller

8.2.1.9 Register 08h: Configuration Data Byte 3
USB 2.0 Hi-Speed Hub Controller
Datasheet
BIT
NUMBER
7:4
3
2:1
0
BIT NAME
Reserved
PRTMAP_EN
LED_MODE
STRING_EN
DESCRIPTION
Reserved
Port mapping enable: Selects the method used by the hub to assign port
numbers and disable ports.
‘0’ = Standard mode
‘1’ = Port mapping mode
LED Mode Selection: The LED_A[x:1]_N and LED_B[x:1]_N pins support
several different modes of operation (depending upon OEM implementation
of the LED circuit).
‘00' = USB Mode
‘01’ = Speed Indication Mode
‘10’ = Same as ‘00’, USB Mode
‘11’ = Same as ‘00’, USB Mode
Warning: Do not enable an LED mode that requires LED pins that are not
available in the specific package being used in the implementation.
Note:
The hub will only report that it supports LED's to the host when
USB mode is selected. All other modes will be reported as No LED
Support.
Enables String Descriptor Support
‘0’ = String support disabled
‘1’ = String support enabled
8.2.1.10 Register 09h: Non-Removable Device
BIT
NUMBER
7:0
BIT NAME
NR_DEVICE
DESCRIPTION
Non-removable Device: Indicates which port(s) include non-removable
devices.
‘0’ = port is removable
‘1’ = port is non-removable
Informs the host if one of the active ports has a permanent device that is
undetachable from the hub. (Note: The device must provide its own
descriptor data.)
When using the internal default option, the NON_REM[1:0] pins will
designate the appropriate ports as being non- removable.
Bit 7= Controls Port 7
Bit 6= Controls Port 6
Bit 5= Controls Port 5
Bit 4= Controls Port 4
Bit 3= Controls Port 3
Bit 2= Controls Port 2
Bit 1= Controls Port 1
Bit 0= Reserved
Revision 1.0 (3-11-09)
40
DATASHEET
SMSC USB251x