Samsung S5PC100 User Manual page 835

S5PC100 USER'S MANUAL (REV1.0)
UHCRHSTAT Bit
Reserved [14:2]
OCI [1]
LPS [0]
5.2.22 USB HcRhPortStatus 1 Register (UHCRHPSTAT1, Address = 0xED40_0054)
The UHC Root Hub Port Status[2:1] registers control and report USB ports 1, and 2 events on a per-port basis.
The lower word of UHCRHPS1/2 reflects the port status, whereas the upper word reflects the status change bits.
Some status bits are implemented with special write behavior (refer to Table 8.9-23). If a transaction (token
through handshake) is in progress when a write to change port status occurs, the resulting port-status change
must be postponed until the transaction completes. The register organization and individual bit definitions are
shown in Table 8.9-23
event.
1 = ConnectStatusChange is a remote wake-up event.
Read as unknown and must be written as zero.
OverCurrentIndicator
This bit reports over-current conditions if the global
reporting is implemented. If set, an over-current condition
exists. If cleared, all power operations are normal. If per-
port over-current protection is implemented, this bit is
always 0
(read) LocalPowerStatus/ (write) ClearGlobalPower
The root hub does not support the local power-status
feature; thus, this bit is always read as 0. In global power
mode (If UHCRHDA[PSM] is clear), this bit is set to turn
off power to all ports (clear PortPowerStatus). In per-port
power mode, it clears PortPowerStatus only on ports
whose port power control mask bit is not set. Clearing to 0
has no effect.
Description
USB HOST CONTROLLER
R/W Reset Value
-
R
R/W
8.9-35