Teledyne LeCroy Serial Data Debug Solutions - Manual (Page 34)

Serial Data Debug Solutions
34 919586 RevA
C HARACTERIZATION U SING C URSORS
Use horizontal cursors to mark locations on the waveform where the time measurement should be done, and
then read the cursor values to establish the measurement. Adjust the timebase or create zooms of the decoded
trace(s) as needed in order to view the signal with enough detail. This is a good method for single-shot / single
measurements.
C HARACTERIZATION U SING M EASUREMENT P ARAMETERS
Measurement parameters can be used to make basic signal integrity or timing measurements of serial data
signals.
Basic parameters, such as Amplitude, Rise, Fall, Overshoot, etc. are ideal for basic signal integrity checks, which
is often all that is required for low speed (~1 Mb/s) serial data signals. Timing parameters, such as Delay, Delta
Delay, Delta Time @ Level, etc., are ideal for measuring timing from trigger to other signals (such as from an
I 2 C
or SPI Trigger to an analog signal). SDAII is ideal for performing standard-specific physical layer measurements
on high speed serial data signals, such as PCI Express. Delta Trig Time is ideal for measuring the time between
segments of a Sequence Mode acquisition.
Please see Isolating and Analyzing Serial Bus Activity topics for more information on Sequence mode.
 Amplitude - Noise and overshoot resistant measurement of the amplitude of the signal (measurement
of amplitude from Top to Base).
 Base - Value of the lowermost state in a bi-modal waveform, such as an I 2 C , SPI , or CAN Message.
 Delay - Time from the trigger to the first transition at the 50% amplitude crossing.