Rainbow Electronics W90N740 - Manual (Page 154)

W90N740
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Host Controller Root Hub Descriptor B Register (HcRhDescriptorB)
This register is only reset by a power-on reset. It is written during system initialization to configure the
Root Hub. These bits should not be written during normal operation.
Register Address R/W Description Reset Value
HcRhDescriptorB 0xFFF0.504C R/W
Host Controller Root Hub Descriptor B
Register
0x0000.0000
Register: HcRhDescriptorB
Bits Reset R/W Description
15-0 0000h R/W
DeviceRemoveable
HYDRA-4 ports default to removable devices.
0 = Device not removable
1 = Device removable
Port Bit relationship
0 : Reserved
1 : Port 1
2 : Port 2
...
15 : Port 15
Unimplemented ports are reserved, read/write '0'.
31-16 0000h R/W
PortPowerControlMask
Global-power switching. This field is only valid if NoPowerSwitching is
cleared and PowerSwitchingMode is set (individual port switching). When
set, the port only responds to individual port power switching commands
(Set/ClearPortPower). When cleared, the port only responds to global
power switching commands (Set/ClearGlobalPower).
0 = Device not removable
1 = Global-power mask
Port Bit relationship - Unimplemented ports are reserved, read/write '0'.
0 : Reserved
1 : Port 1
2 : Port 2
...
15 : Port 15