42.2 UHPHS Host Controller Structural Parameters Register
These fields define structural parameters: number of downstream ports, etc.
| Name: | UHPHS_HCSPARAMS |
| Offset: | 0x04 |
| Reset: | 0x00001303 |
| Property: | Read-only |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| Access | |||||||||
| Reset |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| N_DP[3:0] | P_INDICATOR | ||||||||
| Access | R | R | R | R | R | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| N_CC[3:0] | N_PCC[3:0] | ||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| PPC | N_PORTS[3:0] | ||||||||
| Access | R | R | R | R | R | ||||
| Reset | 0 | 0 | 0 | 1 | 1 | ||||
Bits 23:20 – N_DP[3:0] Debug Port Number
Optional. This register identifies which of the host controller ports is the debug port. The value is the port number (1-based) of the debug port. A non-zero value in this field indicates the presence of a debug port. The value in this register must not be greater than N_PORTS.
Bit 16 – P_INDICATOR Port Indicators
This bit indicates whether the ports support port indicator control. When this bit is a 1, the port status and control registers include a read/writeable field for controlling the state of the port indicator. See UHPHS Port Status and Control Register for a definition of the port indicator control field.
Bits 15:12 – N_CC[3:0] Number of Companion Controllers
This field indicates the number of companion controllers associated with this USB 2.0 host controller.
A zero in this field indicates there are no companion host controllers. Port-ownership hand-off is not supported. Only high-speed devices are supported on the host controller root ports.
A value larger than zero in this field indicates there are companion USB 1.1 host controller(s). Port-ownership hand-offs are supported. High, Full- and Low-speed devices are supported on the host controller root ports.
Bits 11:8 – N_PCC[3:0] Number of Ports per Companion Controller
This field indicates the number of ports supported per companion host controller. It is used to indicate the port routing configuration to system software.
For example, if N_PORTS has a value of 6 and N_CC has a value of 2, then N_PCC could have a value of 3. The convention is that the first N_PCC ports are assumed to be routed to companion controller 1, the next N_PCC ports to companion controller 2, etc. In the previous example, the N_PCC could have been 4, where the first four are routed to companion controller 1 and the last two are routed to companion controller 2.
The number in this field must be consistent with N_PORTS and N_CC.
Bit 4 – PPC Port Power Control
This field indicates whether the host controller implementation includes port power control. A one in this bit indicates the ports have port power switches. A zero in this bit indicates the ports do not have port power switches. The value of this field affects the functionality of the Port Power field in each port status and control register (see UHPHS Port Status and Control Register).
Bits 3:0 – N_PORTS[3:0] Number of Ports
This field specifies the number of physical downstream ports implemented on this host controller. The value of this field determines how many port registers are addressable in the Operational Register Space. Valid values are in the range of 1 to 15.
A zero in this field is undefined.