Samsung S5PC100, User Manual

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S5PC100 USER’S MANUAL (REV1.0) USB HOST CONTROLLER
8.9-41
UHCRHPSTAT2 Bit Description R/W Reset Value
error-babble), 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.
0 = Change in PortEnableStatus.
CSC [16] ConnectStatusChange
This bit is set by hardware whenever 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 set-port-reset,
set-port-enable, or set-port-suspend write occurs, this
bit is set to force the driver to reevaluate the connection
status since these writes must not occur if the port is
disconnected.
0 = No change in CurrentConnectStatus.
1 = Change in CurrentConnectStatus.
NOTE: If the device removable bit in the Root Hub
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. R/W
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 only 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/W
C
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. -