46
Operation Theory
computer’s memory via DMA, and will occupy the PCI
bandwidth.
If the value specified in UC_counter is smaller than the sample
size of the waveform patterns, the waveform will be generated
piece-wisely. For example, if you defined a 16-sample sine
wave and set the UC_counter to 2, the generated waveform
will be a 1/8-cycle sine wave for every waveform period, and a
complete sine wave will be generated for every 8-iterations. If
you specified a UC_counter value that is larger than the
sample size of the waveform LUT (for example, 32), the
generated waveform will be a 2-cycle sine wave for every
waveform period.
Figure 4-16: Finite Iterative Waveform Generation with Post-trigger
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