Protocol analysis
R&S
®
RTP
832User Manual 1337.9952.02 ─ 12
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PCNF - Port Configuration = All Enhanced SuperSpeed ports that support down-
stream port capability can send this link management packet (LMP), which is simi-
lar to Port Capability. If a port, which was to be configured in the upstream facing
mode, does not receive this LMP within a defined time after link initialization, then
the upstream port shall transition to "eSS.Disabled" and a peripheral device shall
try to connect at the other speeds this device supports.
●
PCNR - Port Configuration Response = This link management packet is sent by
the upstream port in response to a Port Configuration and indicates its acceptance
or rejection.
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SDS - Start of Data Stream marks the start of an SDS ordered set. Valid only for
USB 3.1 Gen 2.
●
SKIP - SKIP = SKP compensates for different bit rates between two communicat-
ing ports. SKPs may be dynamically inserted or removed from the data stream.
SKPEND marks the boundary between SKP symbols and the remainder of the
SKP ordered set. (For SuperSpeedPlus operation, unscrambled.)
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STALL - STALL = This transaction packet can only be sent by an endpoint on the
device. It is used to inform the host that the endpoint is halted or that a control
transfer is invalid.
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STATUS - STATUS = This transaction packet can only be sent by the host to a
control endpoint. It is used to inform a control endpoint that the host has initiated
the Status stage of a control transfer.
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SLF - Set Link Function = This link management packet is used to configure func-
tionality that can be changed without leaving the active (U0) state.
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SSPD - Sublink Speed = Speed of a sublink, which is the collection of receive or
transmit lanes between a downstream facing port (DFP) and an upstream facing
port (UFP).
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TS1/TS1A/TS1B - TS1 = Training sequences are ordered sets for initializing bit and
symbol alignment and receiver equalization. Examples are TS1, TS2 and TSEQ.
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TS2 - TS2 = See TS1
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TSEQ - TSEQ = See TS1
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U2IT - U2 Inactivity Timeout = This link management packet is used to define the
timeout from U1 to U2.
●
VDT - Vendor Device Test = Use of this link management packet is intended for
vendor-specific device testing and shall not be used during normal operation of the
link.
Other types
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ERRor - Error = This is not a frame type, but it is included as an artificial entry in
the search and navigate dialog to allow selecting and activating the error search. If
the host error bit is set to "1", this state indicates that the host was unable to accept
the data. The reason can be a CRC error, length error, value out of range, packet
incomplete or unknown error.
●
UDEF - Unknown = Undefined data cannot be identified as any specific USB 3.1
frame, because the measured signal does not match with the specifications of any
defined frame. Therefore, in this case the field is represented by a "?". You cannot
search for "Unknown" or trigger on it, but these types are returned, if an unexpec-
USB 3.1 (option R&S
RTP-K61/K62)
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