Protocol analysis
R&S
®
RTO6
845User Manual 1801.6687.02 ─ 05
●
STA
TUS - 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.
●
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).
●
TS1/TS1A/TS1B - TS1 = Training sequences are ordered sets for initializing bit and
symbol alignment and receiver equalization. Examples are TS1, TS2 and TSEQ.
●
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.
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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-
ted (sub)type has been found. If some rough type identification is possible, the
unknown data may fit one of the following descriptions of unknown types.
●
UDVN - Unknown Device Notification = A Device Notification transaction packet
can only be sent by a device, to inform the host of an asynchronous change in a
device or interface state (e.g., to identify the function within a device that caused
the device to perform a remote wake operation).
●
UHP - Unknown Header Packet = An undefined header packet that starts with
HPSTART, but then the type is invalid.
●
ULMP - Unknown LMP = A Link Management Packet is a type of header packet
primarily used to manage links by communicating information between links part-
ners. LMPs only travel between pairs of directly connected ports.
●
UTP - Unknown TP = A Transaction Packet is a type of header packet used to
communicate information between a device and the host. TPs traverse all the links,
directly connecting the host to a device. They have no payload data, instead they
are used, e.g., to control the flow of data packets or configure devices and hubs.
The frames listed above consist of individual sets of fields. Some frames only contain
one field, others are much longer: up to 29 fields (in case of the "ACK" frame).
USB 3.1 (option R&S R
T
O6-K570)
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