Digi NS9750 - Manual (Page 787)

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U S B C o n t r o l l e r M o d u l e
D02 R/W PSS 0b PortSuspendStatus (read)
0 Port is not suspended
1 Port is suspended
Indicates that the port is suspended or in the resume
sequence. This bit 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 cleared when PortResetStatusChange is set at
the end of the port reset or when the host controller is
placed in the
USBRESUME state. If an upstream resume is
in progress, it should propagate to the host controller.
SetPortSuspend (write)
The host controller driver sets PortEnableStatus by
writing a 1. Writing a 0 has no effect. If
CurrentConnectStatus is cleared, this write does not set
PortSuspendStatus; it sets ConnectStatusChange, which
tells the driver that it tried to suspend a disconnected port.
Bits Access Mnemonic Reset Description
Table 444: HcRhPortStatus[1] register