
Philips Semiconductors
ISP1160
Embedded USB Host Controller
Product data
Rev. 03 — 27 February 2003
57 of 89
9397 750 10765
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Code (Hex): [1] = 15, [2] = 16 — read
Code (Hex): [1] = 95, [2] = 96 — write
2
PSS
(read) PortSuspendStatus: This bit indicates whether the port is
suspended or in the resume sequence. It is set by a
SetSuspendState write and cleared when
PortSuspendStatusChange is set at the end of the resume
interval. This bit cannot be set if CurrentConnectStatus is cleared.
This bit is also cleared when PortResetStatusChange 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
(write) SetPortSuspend: The HCD sets the PortSuspendStatus
bit by writing a logic 1 to this bit. Writing a logic 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.
1
PES
(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 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
(write) SetPortEnable: The HCD sets PortEnableStatus by writing
a logic 1. Writing a logic 0 has no effect. 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.
0
CCS
(read) CurrentConnectStatus: This bit reects the current state
of the downstream port.
0 — no device connected
1 — device connected
(write) ClearPortEnable: The HCD writes a logic 1 to this bit to
clear the PortEnableStatus bit. Writing a logic 0 has no effect.
CurrentConnectStatus is not affected by any write.
Remark: This bit always reads logic 1 when the attached device is
nonremovable (DeviceRemoveable[NDP]).
Table 35:
HcRshPortStatus[1:2] register: bit description…continued
Bit
Symbol
Description