Owners manual

Interfaces
H3 Datasheet(Revision1.2) Copyright© 2015 Allwinner Technology Co.,Ltd.All Rights Reserved. Page 518
This bit is set when hardware events cause the PortEnableStatus bit to be
cleared. Changes from HCD writes do not set this bit. The HCD writes a ‘1’
to clear this bit. Writing a ‘0’ has no effect.
0
no change in PortEnableStatus
1
change in PortEnableStatus
16
R/W
R/W
0x0
ConnectStatusChange
This bit is set whenever a connect or disconnect event occurs. The HCD
writes a ‘1’ to clear this bit. Writing a ‘0’ has no effect. If
CurrentConnectStatus is cleared when a SetPortReset,SetPortEnable, or
SetPortSuspend write occurs, this bit is set to force the driver to
re-evaluate the connection status since these writes should not occur if
the port is disconnected.
0
no change in PortEnableStatus
1
change in PortEnableStatus
Note: If the DeviceRemovable[NDP] bit is set, this bit is set only
after a Root Hub reset to inform the system that the device is attached.
15:10
/
/
0x0
Reserved
9
R/W
R/W
-
(read)LowSpeedDeviceAttached
This bit indicates the speed of the device attached to this port. When set,
a Low Speed device is attached to this port. When clear, a Full Speed
device is attached to this port. This field is valid only when the
CurrentConnectStatus is set.
0
full speed device attached
1
low speed device attached
(write)ClearPortPower
The HCD clears the PortPowerStatus bit by writing a ‘1’ to this bit. Writing
a ‘0’ has no effect.
8
R/W
R/W
0x1
(read)PortPowerStatus
This bit reflects the port’s power status, regardless of the type of power
switching implemented. This bit is cleared if an overcurrent condition is
detected. HCD sets this bit by writing SetPortPower or SetGlobalPower.
HCD clears this bit by writing ClearPortPower or ClearGlobalPower. Which
power control switches are enabled is determined by
PowerSwitchingMode and
PortPortControlMask[NumberDownstreamPort]. In global switching
mode(PowerSwitchingMode=0), only Set/ClearGlobalPower controls
this bit. In per-port power switching (PowerSwitchingMode=1), if the
PortPowerControlMask[NDP] bit for the port is set, only
Set/ClearPortPower commands are enabled. If the mask is not set, only
Set/ClearGlobalPower commands are enabled. When port power is
disabled, CurrentConnectStatus, PortEnableStatus, PortSuspendStatus,
and PortResetStatus should be reset.
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