Datasheet – SMSC USB2524 User Manual
Page 26
USB MultiSwitch
TM
Hub
Datasheet
Revision 1.91 (08-22-07)
26
SMSC USB2524
DATASHEET
7.1.4.11
Register 0Ah: Port Disable For Self Powered Operation (Reset = 0x00)
7.1.4.12
Register 0Bh: Port Disable For Bus Powered Operation (Reset = 0x00)
7.1.4.13
Register 0Ch: Max Power For Self Powered Operation (Reset = 0x00)
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, this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a Host
Controller. The disabled ports must be contiguous, and must be in decreasing
order starting with port 4.
When using the internal default option, the PRT_DIS[1:0] pins will disable the
appropriate ports.
Bit 7= Reserved, always = ‘0’.
Bit 6= Reserved, always = ‘0’.
Bit 5= Reserved, always = ‘0’.
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
PORT_DIS_BP
Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port is
available, ‘1’ = port is disabled.
During Bus-Powered operation, this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a Host
Controller. The disabled ports must be contiguous, and must be in decreasing
order starting with port 4.
When using the internal default option, the PRT_DIS[1:0] pins will disable the
appropriate ports.
Bit 7= Reserved, always = ‘0’.
Bit 6= Reserved, always = ‘0’.
Bit 5= Reserved, always = ‘0’.
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