Rev. 3.0, 03/01, page 331 of 390
HcRhPortStatus[1:2]
This register is reset by the U
SB
R
ESET
state.
Table 18.44 HcRhPortStatus Register
Register: HcRhPortStatus[1:2]
Offset: 54-57,58-5B
Bits
Reset
R/W
Description
31 - 21
0h
-
Reserved. Read/Write 0's
20
0
R/W
PortResetStatusChange
This bit indicates that the port reset signal has completed.
0 = Port reset is not complete.
1 = Port reset is complete.
19
0
R/W
PortOverCurrentIndicatorChange
This bit is set when OverCurrentIndicator changes. Writing a '1'
clears this bit. Writing a '0' has no effect.
18
0
R/W
PortSuspendStatusChange
This bit indicates the completion of the selective resume sequence for
the port.
0 = Port is not resumed.
1 = Port resume is complete.
17
0
R/W
PortEnableStatusChange
This bit indicates that the port has been disabled due to a hardware
event (cleared PortEnableStatus).
0 = Port has not been disabled.
1 = PortEnableStatus has been cleared.
16
0
R/W
ConnectStatusChange
This bit indicates a connection or disconnection event has been
detected. Writing a '1' clears this bit. Writing a '0' has no effect.
0 = No connect/disconnect event.
1 = Hardware detection of connect/disconnect event.
Note:
If Device Removeable is set, this bit is set only after a Root
Hub reset to inform the system that the device is attached.
15 - 10
0h
-
Reserved. Read/Write 0's
9
0
R/W
(read) LowSpeedDeviceAttached
This bit defines the speed (and bud idle) of the attached device. It is
only valid when CurrentConnectStatus is set.
0 = Full Speed device
1 = Low Speed device
(write) ClearPortPower
Writing a '1' clears PortPowerStatus. Writing a '0' has no effect
Содержание HD64465
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