SMSC USB2512Ai - Manual (Page 18)

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
Revision 1.97 (08-11-08) 18 SMSC USB2512Ai
DATASHEET
4.2.1.9 Register 08h: Configuration Data Byte 3
4.2.1.10 Register 09h: Non-Removable Device
BIT
NUMBER BIT NAME DESCRIPTION
7:4 Reserved Reserved
3 PRTMAP_EN Port Re-mapping enable: Selects the method used by the hub to assign port
numbers and disable ports.
‘0’ = Standard Mode
‘1’ = Port Re-map mode
2:0 Reserved Reserved
BIT
NUMBER BIT NAME DESCRIPTION
7:0 NR_DEVICE 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= Reserved, always = ‘0’
Bit 6= Reserved, always = ‘0’
Bit 5= Reserved, always = ‘0’
Bit 4= Reserved, always = ‘0’
Bit 3= Reserved, always = ‘1’
Bit 2= 1; Port 2 non-removable
Bit 1= 1; Port 1 non removable
Bit 0= Reserved, always = ‘0’