Регистры H616: OHCI Root Hub Descriptor Register B

O_HcRhDescriptorB

9.5.3. OHCI Root Hub Descriptor Register B - адрес: 0x520044c 0x531044c 0x531144c (смещение: 0x044C)

Хост-контроллер USB2.0: список регистров

31 |•|•|•|•|•|•|•|•|•|•|•|•|•|•|•|•| 16
15 |•|•|•|•|•|•|•|•|•|•|•|•|•|•|•|•| 00

PORT_POWER_CONTROL_MASK

Bits 31 : 16
R/W (R)
0x0

Each bit indicates if a port is affected by a global power control command when PowerSwitchingMode is set.
When set, the port's power state is only affected by per-port power control (Set/ClearPortPower).
When cleared, the port is controlled by the global power switch (Set/ClearGlobalPower).
If the device is configured to global switching mode (PowerSwitchingMode = 0 ), this field is not valid.

Bit0 : Reserved
Bit1 : Ganged-power mask on Port #1.
***
Bit15 : Ganged-power mask on Port #15.

DEVICE_REMOVABLE

Bits 15 : 0
R/W (R)
0x0

Each bit is dedicated to a port of the Root Hub. When cleared, the attached device is removable.
When set, the attached device is not removable.
Bit0 : Reserved
Bit1 : Device attached to Port #1.
***
Bit15 : Device attached to Port #15.

HCD (HC)

Bit fields structure

typedef union o_hcrhdescriptorb { struct { unsigned device_removable : 16; unsigned port_power_control_mask : 16; } b; unsigned long w; } O_HcRhDescriptorB