Allwinner A20 - Page 691

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 691 / 812
6.8.7.20. HCRHDESCRIPTORB REGISTER
Offset: 0x44c
Register Name: HcRhDescriptorB Register
Default Value:0x0
Bit
Read/Write
Default
Description
HCD
HC
31:16
R/W
R
0x0
PortPowerControlMask
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/Counterpower). 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.
Bit2
Ganged-power mask on Port #2.
…
Bit1
5
Ganged-power mask on Port #15.
15:0
R/W
R
0x0
DeviceRemovable
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.
Bit2
Device attached to Port #2.
…
Bit1
5
Device attached to Port #15.
6.8.7.21. HCRHSTATUS REGISTER
Offset: 0x450
Register Name: HcRhStatus Register
Default Value:0x0
Bit
Read/Write
Default
Description
HCD
HC
31
W
R
0x0
(write)ClearRemoteWakeupEnable
Write a ‘1’ clears DeviceRemoteWakeupEnable. Write a ‘0’ has
no effect.
30:18
/
/
/
Reserved
17
R/W
R
0x0
OverCurrentIndicatorChang
This bit is set by hardware when a change has occurred to the
OverCurrentIndicator field of this register. The HCD clears this bit
by writing a ‘1’.Writing a ‘0’ has no effect.
(read)LocalPowerStartusChange