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Appendicies
133
9
9.1
Appendicies
· DigiView Compression 133
· Hardware Specifications 135
DigiView Compression
There is no need to understand DigiView's compression to use it. This is just here for the
curious (or skeptical).
We want two conflicting features in a logic analyzer; high sample RATES (high resolution) and
high sample COUNTs (a lot of data/time). We usually reduce sampling RATES to capture more
data because sample COUNTs (data buffer depth) is fixed. To combat this trade-off, the sample
buffer is made as deep as possible. However, this approach is linear and does not scale well.
Doubling the buffer doubles either TIME or sample RESOLUTION. It can take gigabytes of
memory to achieve both if your data transitions are fairly sparse (microsecond or more gaps).
Ideally, we would like to have high sample RATES AND high sample COUNTs to capture a long
time-span with high resolution.
DigiView achieves this, like other logic analyzers, by using a deep data buffer. However, DigiView
also attacks this problem from another, even more effective angle. DigiView uses one or more
real-time, hardware based compression techniques to compact the captured data. This has a
much greater impact than increasing the buffer depth.
Most data you are likely to monitor lends itself well to our compression technique(s). Compression
ratios of 100:1 are common. With sparse data, compression ratios of over 200,000:1 are
achievable. Since the degree of compression depends on the amount of activity, you will achieve
maximum compression if you only define signals of interest. DigiView analyzers will always
sample at the maximum rate for the mode selected. Due to automatic real-time compression
techniques, you receive the benefits that down-sampling would achieve (longer captures) without
the loss of data resolution.
The data captured in logic analyzer applications is often stable for multiple sample periods
(particularly at higher sample rates). This, coupled with fast sample times and a very long
run-length limit, makes our compression very applicable in real-world applications.
To illustrate the effect of DigiView's compression and also present it in a manner that is more
relevant to real-world usage, we have calculated several typical performance benchmarks for each
DigiView Model and sampling mode. You may actually see better performance ratings than the
conservative estimations below.
DV3109
DV3209
DV3409
DV3100
DV3200
DV3400
Sample Depth
( SR: Sample Rate,
DR: Data Rate,
Q: Quadrillion or 10^15 )
? 2014 TechTools
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