Owners manual

Interfaces
H3 Datasheet(Revision1.2) Copyright© 2015 Allwinner Technology Co.,Ltd.All Rights Reserved. Page 515
10
R
R
0x0
Device Type
This bit specifies that the Root Hub is not a compound device. The Root
Hub is not permitted to be a compound device. This field should always
read/write 0.
9
R/W
R
1
PowerSwitchingMode
This bit is used to specify how the power switching of the Root Hub ports
is controlled. It is implementation-specific. This field is only valid if the
NoPowerSwitching field is cleared.
0
All ports are powered at the same time.
1
Each port is powered individually. This mode allows port power
to be controlled by either the global switch or per-port
switching. If the PortPowerControlMask bit is set, the port
responds only to port power commands (Set/ClearPortPower).
If the port mask is cleared, then the port is controlled only by
the global power switch (Set/ClearGlobalPower).
8
R/W
R
0
NoPowerSwithcing
These bits are used to specify whether power switching is supported or
ports are always powered. It is implementation-specific. When this bit is
cleared, the PowerSwitchingMode specifies global or per-port switching.
0
Ports are power switched.
1
Ports are always powered on when the HC is powered on.
7:0
R
R
0x01
NumberDownstreamPorts
These bits specify the number of downstream ports supported by the
Root Hub. It is implementation-specific. The minimum number of ports is
1. The maximum number of ports supported.
8.5.2.6.20. HcRhDescriptorB Register(Default Value: 0x00000000)
Offset: 0x44c
Register Name: HcRhDescriptorB Register
Bit
Read/Write
Default/Hex
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/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.
Bit2
Ganged-power mask on Port #2.
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