Owners manual

Interfaces
H3 Datasheet(Revision1.2) Copyright© 2015 Allwinner Technology Co.,Ltd.All Rights Reserved. Page 519
0
port power is off
1
port power is on
(write)SetPortPower
The HCD writes a ‘1’ to set the PortPowerStatus bit. Writing a ‘0’ has no
effect.
Note: This bit is always reads ‘1b’ if power switching is not supported.
7:5
/
/
0x0
Reserved
4
R/W
R/W
0x0
(read)PortResetStatus
When this bit is set by a write to SetPortReset, port reset signaling is
asserted. When reset is completed, this bit is cleared when
PortResetStatusChange is set. This bit cannot be set if
CurrentConnectStatus is cleared.
0
port reset signal is not active
1
port reset signal is active
(write)SetPortReset
The HCD sets the port reset signaling by writing a ‘1’ to this bit. Writing a
‘0’ has no effect. If CurrentConnectStatus is cleared, this write does not
set PortResetStatus, but instead sets ConnectStatusChange. This informs
the driver that it attempted to reset a disconnected port.
3
R/W
R/W
0x0
(read)PortOverCurrentIndicator
This bit is only valid when the Root Hub is configured in such a way that
overcurrent conditions are reported on a per-port basis. If per-port
overcurrent reporting is not supported, this bit is set to 0. If cleared, all
power operations are normal for this port. If set, an overcurrent condition
exists on this port. This bit always reflects the overcurrent input signal.
0
no overcurrent condition.
1
overcurrent condition detected.
(write)ClearSuspendStatus
The HCD writes a ‘1’ to initiate a resume. Writing a ‘0’ has no effect. A
resume is initiated only if PortSuspendStatus is set.
2
R/W
R/W
0x0
(read)PortSuspendStatus
This bit indicates the port is suspended or in the resume sequence. It is
set by a SetSuspendState write and cleared when
PortSuspendStatusChange is set at the end of the resume interval. This bit
cannot be set if CurrentConnectStatus is cleared. This bit is also cleared
when PortResetStatusChange is set at the end of the port reset or when
the HC is placed in the USBRESUME state. If an upstream resume is in
progress, it should propagate to the HC.
0
port is not suspended
1
port is suspended
confidential