Samsung S5PC100, User Manual

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S5PC100 USER’S MANUAL (REV1.0) USB HOST CONTROLLER
8.9-37
UHCRHPSTAT
1
Bit Description R/W Reset Value
Descriptor B register is set (indicating that this device is
not removable), then the CSC bit is set only after a root
hub reset to inform the system that the device is
attached.
Reserved [15:10] Read as unknown and must be written as zero. -
LSDA [9] (read) LowSpeedDeviceAttached / (write)
ClearPortPower
If read, this bit indicates the speed of the device
attached to this port. If set, a low-speed device is
attached to this port. If clear, a fullspeed device is
attached to this port. This field is valid if the
CurrentConnectStatus is set. If the HCD writes a 1 to
this bit, the controller clears the PortPowerStatus bit.
Writing a 0 has no effect.
0 = Full-speed device attached.
1 = Low-speed device attached. R/WC
PPS [8] (read) PortPowerStatus / (write) SetPortPower
This bit reflects the PortPowerStatus, regardless of the
type of powerswitching implemented. This bit is cleared
if an over-current condition is detected. HCD sets this
bit by writing Set Port Power (writing a 1 to this bit,
UHCRHPS1/2/3[PPS]) or Set Global Power
(UHCRHS[LPSC]). HCD clears this bit by writing Clear
Port Power (writing a 1 to UHCRHPS1/2/3[LSDA]) or
Clear Global Power (UHCRHS[LPS]).
0 = Port power is off.
1 = Port power is on.
The HCD writes a 0b1 to set the PortPowerStatus bit.
Writing 0b0 has no effect
R/W
Reserved [7:5] Read as unknown and must be written as zero. -
PRS [4] (read) PortResetStatus / (write) SetPortReset
If this bit is set by an HCD write to set port reset, port
reset signaling is asserted. If reset is complete, this bit
is cleared when PortResetStatusChange is set. This bit
cannot be set if CurrentConnectStatus is cleared. 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 port-reset status, but
instead sets connect-status-change. This informs the
driver that it attempted to reset a disconnected port.
0 = Port reset signal is not active.
1 = Port reset signal is active.
R/W
POCI [3] (read) PortOverCurrentIndicator / (write)
ClearSuspendStatus
If read, this bit is valid only when the root hub is
configured in such a way that over-current conditions
are reported on a per-port basis. If per-port over-current R/W