Teledyne LeCroy Serial Data Debug Solutions - Manual (Page 60)

Serial Data Debug Solutions
60 919586 RevA

Bits per Word and Bit Order - Provide a number of bits per word and select either MSB or LSB bit order
format, as appropriate.
Note: Identical selections for Clock Polarity, Clock Phase, and Data are located in the SPI trigger setup
dialog. If you have a single SPI decoder set up, these settings are linked dynamically and copy over from
the trigger setup, and vice versa. If you have multiple SPI decoders setup, these settings are also
dynamically linked and copy over to the lowest numbered SPI Decoder from the trigger setup, and vice
versa. This ensures that the decode address format matches trigger setup information.

CS Polarity and Decode Outside CS - Set the Chip Select Polarity to either Active Low or Active High. Also,
mark the Decode Outside CS checkbox if you want to decode all SPI bytes instead of those active during
the Chip Select.
SPIbus Levels Right-Hand Dialog
The Levels right-hand dialog provides detailed controls and setup conditions as follows:

Level Type and Level - The message decoding algorithm setup is performed here. The level is normally set
up in %, and defaults to 50%. Adjust the level by touching inside the number area to highlight the box
title, and then use the oscilloscope front panel Adjust knob to make your change. Alternatively, touch
inside the number area twice and select a value using the pop-up numeric keypad.
PLEASE NOTE THE FOLLOWING:

The set Level appears as a dotted horizontal line across the oscilloscope grid.

If initial decoding indicates that there are a number of error frames, make sure that the level is set
to a reasonable value.
Creating a SPIbus Trigger Condition
The SPIbus Trigger dialog, with detail on some of the setup conditions, is shown in the following topics.
Note: Refer to Using The D Supported Protocol Toolsets (on page 14) to correctly access the Trigger Condition
dialog specific to your desired protocol.