Datasheet

USB 2.0 Hi-Speed Hub Controller
Datasheet
SMSC USB251xB/xBi 33 Revision 2.2 (02-17-12)
DATASHEET
5.1.11 Register 0Ah: Port Disable For Self-Powered Operation
5.1.12 Register 0Bh: Port Disable For Bus-Powered Operation
BIT
NUMBER BIT NAME DESCRIPTION
7:0 PORT_DIS_SP Port Disable Self-Powered: disables one or more ports.
0 = port is available
1 = port is disabled
Bit 7 : rsvd
Bit 6 : rsvd
Bit 5 : rsvd
Bit 4 : controls port 4
Bit 3 : controls port 3
Bit 2 : controls port 2
Bit 1 : controls port 1
Bit 0 : rsvd
During self-powered operation when mapping mode is disabled
(
PRTMAP_EN = 0), this register selects the ports that will be permanently
disabled. These ports are then unavailable and cannot be enabled or
enumerated by a host controller. The ports can be disabled in any order,
where the internal logic will automatically report the correct number of
enabled ports to the USB host. The active ports will be reordered in order
to ensure proper function.
When using the default configuration, PRT_DIS_P[x:1] and PRT_DIS_M[x:1]
pins disable the appropriate ports.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 PORT_DIS_BP Port Disable Bus-Powered: disables one or more ports.
0 = port is available
1 = port is disabled
Bit 7 : rsvd
Bit 6 : rsvd
Bit 5 : rsvd
Bit 4 : controls port 4
Bit 3 : controls port 3
Bit 2 : controls port 2
Bit 1 : controls port 1
Bit 0 : rsvd
During self-powered operation when mapping mode is disabled
(
PRTMAP_EN = 0), this selects the ports which will be permanently
disabled.These ports are then unavailable and cannot be enabled or
enumerated by a host controller. The ports can be disabled in any order,
where the internal logic will automatically report the correct number of
enabled ports to the USB host. The active ports will be reordered in order to
ensure proper function.
When using the internal default option, the PRT_DIS_P[x:1] and
PRT_DIS_M[x:1] pins disable the appropriate ports.