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High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller
Datasheet
Revision 1.0 (06-01-09) 44 SMSC USB4640/USB4640i
DATASHEET
8.4.4.11 E8h: Port Disable For Self-Powered Operation
8.4.4.12 E9h: Port Disable For Bus-Powered Operation
8.4.4.13 EAh: Max Power For Self-Powered Operation
BIT BYTE NAME DESCRIPTION
7:0 PORT_DIS_SP Disables 1 or more ports.
‘0’ = Port is available
‘1’ = Port is disabled
During self-powered operation
this register selects the ports which will be
permanently disabled. The ports are unavailable to be enabled or
enumerated by a host controller. The ports can be disabled in any order
since 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
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= Controls physical port 3
Bit 2= Controls physical port 2
Bit 1= Controls physical port 1
Bit 0= Reserved
BIT BYTE NAME DESCRIPTION
7:0 PORT_DIS_BP Disables 1 or more ports.
‘0’ = Port is available
‘1’ = Port is disabled
During self-powered operation
, this register selects the ports which will be
permanently disabled. The ports are unavailable 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= Controls physical port 3
Bit 2= Controls physical port 2
Bit 1= Controls physical port 1
Bit 0 is Reserved
BIT BYTE NAME DESCRIPTION
7:0 MAX_PWR_SP Value in 2 mA increments that the hub consumes when operating as a self-
powered hub. This value includes the hub silicon along with the combined
power consumption 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 0 mA in its descriptors.
Note: The USB 2.0 Specification does not permit this value to exceed 100
mA.