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Logic Analyzer Concepts
Transitional Mode Theory (1660E/ES/EP-series only)
250-MHz Transitional mode
Transitional timing running at 250 MHz is the same as the 125-MHz
mode, except that two single-pod data samples (17 bits x 2 = 34 bits)
are stored instead of one full-pod-pair data sample (34 bits). This is
because in half-channel mode, data is multiplexed into the pipeline in
two 17-bit samples. The first 17-bit sample is latched, and at the next
17-bit sample both samples are sent down the pipeline.
This operation keeps the pipeline frequency at 125 MHz, which means
the transition detector still looks at a full 34 bits. Essentially, the
transition detector is looking at two samples at a time instead of one. In
the 250-MHz mode, between 682 and 4094 transitions are stored.
Minimum Transitions Stored
405
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Troubleshooting
