ISP1362
Single-chip USB OTG controller
Philips Semiconductors
Table 62: HcRhPortStatus[1:2] register: bit description…continued
Bit
Symbol
Description
2
PSS
On read—PortSuspendStatus: This bit indicates whether the port
is suspended or is in the resume sequence. It is set by a
SetSuspendState write and cleared when
PortSuspendStatusChange (PSSC) is set at the end of the resume
interval. This bit cannot be set if CurrentConnectStatus (CCS) is
cleared. This bit is also cleared when PortResetStatusChange
(PRSC) is set at the end of the port reset or when the HC is placed
in the USBResume state. If an upstream resume is in progress, it
should propagate to the HC.
0 — port is not suspended
1 — port is suspended
On write—SetPortSuspend: The HCD sets the
PortSuspendStatus (PSS) bit by writing logic 1 to this bit. Writing
logic 0 has no effect. If CurrentConnectStatus (CCS) is cleared,
this write does not set PortSuspendStatus (PSS); instead it sets
ConnectStatusChange (CSC). This informs the driver that it
attempted to suspend a disconnected port.
1
PES
On read—PortEnableStatus: This bit indicates whether the port is
enabled or disabled. The Root Hub may clear this bit when an
overcurrent condition, disconnect event, switched-off power or
operational bus error, such as babble, is detected. This change
also causes PortEnabledStatusChange to be set. The HCD sets
this bit by writing SetPortEnable and clears it by writing
ClearPortEnable. This bit cannot be set when
CurrentConnectStatus (CCS) is cleared. This bit is also set, if it is
not already, at the completion of a port reset when
ResetStatusChange is set or port suspend when
SuspendStatusChange is set.
0 — port is disabled
1 — port is enabled
On write—SetPortEnable: The HCD sets PortEnableStatus (PES)
by writing logic 1. Writing logic 0 has no effect. If
CurrentConnectStatus (CCS) is cleared, this write does not set
PortEnableStatus (PES), but instead sets ConnectStatusChange
(CSC). This informs the driver that it attempted to enable a
disconnected port.
0
CCS
On read—CurrentConnectStatus: This bit reflects the current
state of the downstream port.
0 — no device connected
1 — device connected
On write—ClearPortEnable: The HCD writes logic 1 to this bit to
clear the PortEnableStatus (PES) bit. Writing logic 0 has no effect.
CurrentConnectStatus (CSC) is not affected by any write.
Remark: This bit always reads 1B when the attached device is
nonremovable (DeviceRemoveable[NDP]).
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© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data
Rev. 03 — 06 January 2004
91 of 150
NXP [ NXP ]
