Rohde & Schwarz RTE - Page 887

Protocol analysis
R&S
®
RTE
887User Manual 1326.1032.02 ─ 20
Optionally, you can define a frame ID pattern or a frame ID range to trigger only on
frames that fulfill these conditions.
See:"Frame ID" on page 887.
Error ← Trigger type
Triggers if one or more of the following errors occur:
●
"IFS error"
The inter-frame space (IFS) is a bit field after a frame that has a logical value 1. It
is used to separate two consecutive frames. IFS errors occur when the length of
the IFS field differs from the one defined in the protocol.
●
"IBS error"
The inter-byte-space (IBS) is the interval between each byte within a frame. IBS
errors occur when the length of the IBS field differs from the one defined in the pro-
tocol.
●
"Length error"
Length error occurs when there are not enough bits/words to build a frame.
●
"DLC error"
Data length code error occurs when the value of the DLC field is different from the
data byte field value. If there is a DLC error, it is still possible to build a frame, but
there are too many/too few data words.
●
"CRC error"
The transmitting node calculates the cyclic redundancy check (CRC) value of a
frame and stores it into the CRC field of the frame. CRC error occurs when this
CRC field value differs from the value calculated by the receiving node.
●
"Parity error"
Triggers on a parity error indicating a transmission error.
●
"UART error"
For the CXPIstandard, each 8-bit byte is transported as a 10-bit UART word,
framed by a start bit (1) and stop bit (0). An UART error occurs if the identified sym-
bol does not follow the described pattern, if it is too short or too long.
Frame ID
The frame identifier is a 7-bit field. Its setup consists of the condition and one or two
frame patterns.
"Condition"
Defines the operator to set a specific frame identifier ("Equal" or "Not
equal") or a frame identifier range.
"Frame ID
min / Frame
ID"
Defines the bit pattern of the frame identifier.
In binary format, use the following characters: 1; 0; or X (do not care).
To enter the pattern in other formats use the bit pattern editor, see
Chapter 13.1.5, "Bit pattern editor", on page 521.
CXPI (option R&S RTE-K76)