Datasheet – SMSC USB2512Ai User Manual
Page 19
Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512Ai
19
Revision 1.97 (08-11-08)
DATASHEET
4.2.1.11
Register 0Ah: Port Disable For Self-Powered Operation
4.2.1.12
Register 0Bh: Port Disable For Bus-Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PORT_DIS_SP
Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
During Self-Powered operation
when remapping mode is disabled
(PRTMAP_EN='0'),
this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a Host
Controller. The ports can be disabled in any order, the internal logic will
automatically report the correct number of enabled ports to the USB Host,
and will reorder the active ports in order to ensure proper function.
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 is disabled
Bit 1= 1; Port 1 is disabled
Bit 0= Reserved, always = ‘0’
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PORT_DIS_BP
Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
During Self-Powered operation
when remapping mode is disabled
(PRTMAP_EN='0'),
this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a Host
Controller. The ports can be disabled in any order, the internal logic will
automatically report the correct number of enabled ports to the USB Host,
and will reorder the active ports in order to ensure proper function.
When using the internal default option, the PRT_DIS[1:0] pins will disable the
appropriate ports.
Bit 7= Reserved
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= Reserved, always = ‘1’
Bit 2= 1; Port 2 is disabled
Bit 1= 1; Port 1 is disabled
Bit 0 is Reserved, always = ‘0’