Protocol analysis
R&S
®
RTP
831User Manual 1337.9952.02 ─ 12
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CP0 - compliance data pattern. Runs in scrambled mode.
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CP1/CP2 - compliance data pattern. Run in unscrambled mode.
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CP3/CP5or6 - compliance data pattern. Run in both scrambled and unscrambled
mode.
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DPH - DPH = Data Packet Header, containing a type field, the data packet’s
address, route string, length, and other information about the packet, including a 2-
byte checksum (CRC-16).
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DPH n-def - = non-deferred Data Packet Header, containing a type field, the data
packet’s address, route string, length field replica, and other information about the
packet, including a 2-byte checksum (CRC-16). Valid only for USB 3.1 Gen 2.
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DPP - Data Packet Payload = The packet’s payload data and a 32-bit CRC.
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DPPA - Data Packet Payload Abort = Frame ordered set used to abort a data
packet payload.
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ERDY - ERDY = The Endpoint Ready notification is a handshake packet indicating
a positive acknowledgment.
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FWAKe - Function Wake = The function wake device notification is sent from a
device (that is enabled for remote wakeup) to the host, if it wants to exit from
"device suspend" or "function suspend".
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HRR - Host Role Request = This notification type is reserved for being issued by
a SuperSpeed On-the-Go (SS-OTG) device, if its Role Swap Protocol (RSP) capa-
bility has been enabled.
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IDLE - IDLE = Logical Idle is a period of one or more symbol periods when no
information (packets or link commands) is transferred on the link. The Idle Symbol
(IS) is transmitted by a port at any time in the active (U0) state meeting the logical
idle definition.
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ITP - ITP = Isochronous Timestamp Packet, sent periodically by a host to inform
devices on the USB of the current bus time. ITPs are multicast on all active links.
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LTM - Latency Tolerance = Latency Tolerance Messaging is an optional normative
USB power management feature that utilizes reported BELT (Best Effort Latency
Tolerance) values to enable more power efficient platform operation.
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LC - Link Command = An eight-symbol sequence used for link-level flow control,
retries, power management and device removal.
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LDM - Link Delay Measurement = A protocol for determining propagation delays
through the USB topology with a high degree of accuracy (sometimes called "Pre-
cision Time Measurement").
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NRDY - NRDY = The Not Ready response is a handshake packet indicating a neg-
ative acknowledgment.
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PING - PING = This transaction packet can only be sent by the host, to transition
all links, which are in the path to a device, back to the active (U0) state prior to ini-
tiating an isochronous transfer.
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PNGR - PING_RESPONSE = This transaction packet is sent by a device in
response for each PING received from the host.
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PCAP - Port Capability = This link management packet describes each port's link
capabilities and is sent by both link partners after the successful completion of
training and link initialization.
USB 3.1 (option R&S
RTP-K61/K62)
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