USB2640I Standard Microsystems Corp., USB2640I Datasheet - Page 41

• Manufacturer Part Number: USB2640I
• Description: Industrial Temperature Usb 2.0 Flash Media Controller And Usb Hub Combo
• Manufacturer: Standard Microsystems Corp.

Industrial Temperature USB 2.0 Flash Media Controller and USB Hub Combo
SMSC USB2640i/USB2641i
7.3.3.22
7.3.3.23
7.3.3.24
NUMBER
NUMBER
NUMBER
BIT
BIT
BIT
7:0
7:0
7:0
E9h: Port Disable For Bus-Powered Operation
EAh: Max Power For Self-Powered Operation
EBh: Max Power For Bus-Powered Operation
PORT_DIS_BP
MAX_PWR_SP
MAX_PWR_BP
BYTE NAME
BYTE NAME
BYTE NAME
Port Disable Bus-Powered: Disables 1 or more ports. ‘0’ = port is available,
‘1’ = port is disabled.
During Self-Powered operation
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= 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’
Max Power Self_Powered: Value in 2 mA increments that the hub consumes
Max Power Bus_Powered: Value in 2 mA 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 0
mA in its descriptors.
Note:
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 0
mA in its descriptors.
The USB 2.0 Specification does not permit this value to exceed 100
mA.
DATASHEET
41
DESCRIPTION
DESCRIPTION
DESCRIPTION
,
this register selects the ports which will be
Revision 2.0 (10-03-08)