Teledyne LeCroy USB2-HSIC Decoder - Manual (Page 11)

Instruction Manual
Working with the Decode Trace
Reading Waveform Annotations
When a decoder is enabled, an annotated waveform appears on the oscilloscope display, allowing you to
quickly read the results of the decode.
A colored overlay marks significant transitions in the source signal. The overlay contains annotations
corresponding to the data itself, any pre/post-message padding, inter-burst periods, etc. Each set of
annotations is customized to the protocol or encoding scheme.
The amount of information shown on an annotation is affected by the width of the rectangles in the overlay,
which is determined by the magnification (scale) of the trace and the length of the acquisition. Zooming a
portion of the decode trace will reveal the detailed annotations.
USB2 W AVEFORM A NNOTATIONS
These overlays appear on a USB2 waveform or its Zoom trace to highlight key elements of the decoded signal
(some annotations are not shown on the screen-shot).
Annotation Overlay Color
Transaction Dark Purple (behind all fields)
Packet (Handshake, Token, or Data) Charcoal (behind fields)
Control Sequences (Synch bits, PID
bits, Check bits, or EOP bits) Green (different label over each field)
Device Address Light Purple
Endpoint Grey
Data Payload Green
CRC5 or CRC7 Royal Blue
Inter-packet Idle Royal Blue
Inter-transaction Idle Blue-Green
Decoded USB2 waveform. At this resolution, little information appears on the overlay.
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