Datasheet

USB 2.0 Hi-Speed 7-Port Hub Controller
Datasheet
Revision 2.8 (09-17-12) 26 SMSC USB2517
DATASHEET
7.2.1.12 Register 0Bh: Port Disable For Bus Powered Operation
7.2.1.13 Register 0Ch: Max Power For Self Powered Operation
7.2.1.14 Register 0Dh: Max Power For Bus Powered Operation
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_P[7:1] and
PRT_DIS_M[7:1] pins will disable the appropriate ports.
Bit 7= 1; Port 7 is disabled
Bit 6= 1; Port 6 is disabled
Bit 5= 1; Port 5 is disabled
Bit 4= 1; Port 4 is disabled
Bit 3= 1; Port 3 is disabled
Bit 2= 1; Port 2 is disabled
Bit 1= 1; Port 1 is disabled
Bit 0 is Reserved, always = ‘0’
BIT
NUMBER BIT NAME DESCRIPTION
7:0 MAX_PWR_SP Max Power Self_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 MAX_PWR_BP Max Power Bus_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.