424 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
26 CXPI Triggering and Serial Decode
• "IBS ERR" — Inter-Byte Space error. When the space between bytes in a
frame is greater than 9 bits.
• "IFS ERR" — Inter-Frame Space error. When there are fewer than 10 bits
present in the idle state before a new frame starts.
• "FRAME ERR" — Framing error. When the stop bit is not a logical 1.
• "LEN ERR" — Data Length error. If the frame has more data bytes than are
indicated in the DLC field.
• "SAMP ERR" — Sample error. If 10 logical 0s are detected consecutively.
• "?" — (unknown)
• Pink vertical bars — Expand horizontal scale (and run again) to see decode.
• Red Dot — More information is available. Decoded text is truncated to fit.
Expand the horizontal scale to view the information.
When the bus goes into sleep conditions, special frames are drawn:
• SLEEP frame — orange. Displayed 2.5 ms after the bus goes idle-high. In the
Lister, the fixed hex data values in the Data column are replaced by the text
"SLEEP FRAME".
• WAKE frame — blue. When a low pulse of 250-2500 µs is detected, it is a
wakeup pulse, and a blue WAKE frame will be drawn. After that pulse will be an
orange line. The decode line will turn blue/idle after the first 10 clock ticks are
detected (but not before).
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