Rev. 3.0, 03/01, page 310 of 390
Root Hub
The Root Hub is a collection of ports which are individually controlled and a hub which maintains
control/status over functions common to all ports. The typical command request interface to the
hub is emulated by the HCD which communicates directly through the system bus (PCI) to the hub
and port controls. The remainder of this section will divide the discussion into hub and port design
responsibilities.
The Root Hub descriptor registers, HcRhDescriptorA and HcRhDescriptorB, are implemented
R/W to allow multiple configuration with minimal changes to the current implementation.
Hub and port control and status are implemented through the HcRhStatus and HcRhPortStatus
registers. Each port has its own HcRhPortStatus registers. A command structure is defined through
these registers which software uses to control the hub and ports. By writing a ‘1’ to bit locations
specified in register description Sections. The following commands summarized in can be
executed. The command behavior is discussed in the sections below
Table 18.20 Hub / Port Commands
Command
Register
Description
SetGlobalPower
HcRhStatus
Enable Power to all Ports connected to the
global switch.
ClearGlobalPower
HcRhStatus
Disable Power to all Ports connected to the
global switch
SetPortPower
HcRhPortStatus
Enable Power to Port
ClearPortPower
HcRhPortStatus
Disable Power to Port
SetPortEnable
HcRhPortStatus
Enable Port
ClearPortEnable
HcRhPortStatus
Disable Port
SetPortSuspend
HcRhPortStatus
Selectively Suspend Port
ClearPortSuspend
HcRhPortStatus
Selectively Resume Port
SetPortReset
HcRhPortStatus
Enable Port Reset Signaling
Summary of Contents for HD64465
Page 25: ...Rev 3 0 03 01 page 6 of 390 ...
Page 59: ...Rev 3 0 03 01 page 40 of 390 ...
Page 97: ...Rev 3 0 03 01 page 78 of 390 ...
Page 147: ...Rev 3 0 03 01 page 128 of 390 ...
Page 199: ...Rev 3 0 03 01 page 180 of 390 ...
Page 247: ...Rev 3 0 03 01 page 228 of 390 ...
Page 385: ...Rev 3 0 03 01 page 366 of 390 ...
Page 389: ...Rev 3 0 03 01 page 370 of 390 ...
Page 409: ...Rev 3 0 03 01 page 390 of 390 ...