RM0082
HS_USB2.0 host
Doc ID 018672 Rev 1
459/844
Table 387.
HcRhPortStatus register bit assignments
Bits
Name
Reset
Read/write
Description
HCD
HC
[31:21]
Reserved
[20]
PRSC
0b
R/W
R/W
PortResetStatusChange
This bit is set at the end of the 10-ms port reset signal.
The HCD writes a ‘1’ to clear this bit. Writing a ‘0’ has no
effect.
0 = port reset is not complete
1 = port reset is complete
[19]
OCIC
0b
R/W
R/W
PortOverCurrentIndicatorChange
This bit is valid only if overcurrent conditions are reported
on a per-port basis. This bit is set when Root Hub
changes the PortOverCurrentIndicator bit. The HCD
writes a ‘1’ to clear this bit. Writing a ‘0’ has no effect.
0 = no change in PortOverCurrentIndicator
1 = PortOverCurrentIndicator has changed
[18]
PSSC
0b
R/W
R/W
PortSuspendStatusChange
This bit is set when the full resume sequence has been
completed. This sequence includes the 20-s resume
pulse, LS EOP, and 3-ms resychronization delay. The
HCD writes a ‘1’ to clear this bit. Writing a ‘0’ has no
effect. This bit is also cleared when ResetStatusChange is
set.
0 = resume is not completed
1 = resume completed
[17]
PESC
0b
R/W
R/W
PortEnableStatusChange
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]
CSC
0b
R/W
R/W
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 CurrentConnectStatus
1 = change in CurrentConnectStatus
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]
Reserved