Samsung S5PC100, User Manual

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USB HOST CONTROLLER S5PC100 USER’S MANUAL (REV1.0)
8.9-38
UHCRHPSTAT
1
Bit Description R/W Reset Value
reporting is not supported, this bit is forced to 0. If this
bit is cleared, all power operations are normal for this
port. If set, an over-current condition exists on this port.
This bit always reflects the over-current input signal.
The HCD writes a 1 to this bit to initiate a resume.
Writing a 0 has no
effect. A resume is initiated only if PortSuspendStatus is
set.
0 = No over-current condition.
1 = Over-current condition detected.
PSS [2] (read) PortSuspendStatus / (write) SetPortSuspend
This bit indicates if the port is suspended or in the
resume sequence (1). If it is a 0, the port is not
suspended or in the resume sequence. It is set by a set
suspend state write and cleared if PortSuspendStatus
change is set at the end of the resume interval. This bit
cannot be set if CurrentConnectStatus is cleared. This
bit is also cleared if PortResetStatus change is set at
the end of the port reset, or if the UHC is placed in the
USBRESUME state. If an upstream resume is in
progress, it must propagate to the HC. The HCD sets
the PortSuspendStatus bit by writing a 1 to this bit.
Writing a 0 has no effect. If CurrentConnectStatus is
cleared, this write does not set PortSuspendStatus;
instead it sets ConnectStatusChange. This informs the
driver that it attempted to suspend a disconnected port.
0 = Port is not suspended.
1 = Port is suspended.
R/W
PES [1] (read) PortEnableStatus / (write) SetPortEnable
This bit indicates whether the port is enabled (1) or
disabled (0). The root hub clears this bit if an over-
current condition, disconnect event, switched-off power,
or operational bus error, such as babble, is detected.
This change also causes the port enabled status
change bit (UHCRHPS1/2/3[PESC] to be set. The HCD
sets the PortEnableStatus bit, by writing a 1
to it, and clears this bit by writing a 1 to clear port
enable (UHCRHPS1/2/3[CCS], bit 0 of this register). If
CurrentConnectStatus is cleared, this write does not set
PortEnableStatus, but instead sets
ConnectStatusChange. This informs the driver that it
attempted to enable a disconnected port. Writing a 0 to
the PortEnableStatus bit has no effect. This bit is also
set, if
not already, at the completion of a port reset when reset
status change (UHCRHPS1/2/3[PRSC]) is set or port
suspend if suspend status change
(UHCRHPS1/2/3[PSSC]) is set R/W