[chbot] DigitalDiscovery : synchronous clocking

[Mark Atherton]

"synchronous capture" - capture data using an external clock. Data which 
is stable 1ns(?) either side of a clock rising edge is acquired - this 
not the same as triggering off of input flag.

This is an available mode on my (old/fast) ANT16, as it is with all of 
the HP logic analysers I have used.

One of the difficulties with the mode is that incoming clocks need to be 
time-stamped.

-Mark


On 19/01/2018 10:35 AM, Charles Manning wrote:
> Please explain what you mean by "synchronous capture and generation".
>
>
>
> On Thu, Jan 18, 2018 at 7:23 PM, Mark Atherton <markaren1 at xtra.co.nz 
> <mailto:markaren1 at xtra.co.nz>> wrote:
>
>     Charles,
>
>     does this unit do synchronous capture and generation ?
>
>     -M
>
>     On 18/01/2018 5:50 PM, Charles Manning wrote:
>
>         Even if it works under Wine, it will likely have issues due to
>         not being able to transfer at full USB speeds.
>
>         The Saleae kit is good. Anyone who rips them off is scummy IMHO.
>
>         I have an old Salaea (8 chan/24Msps) and have recently bought
>         a DigitalDiscovery from Digilent because I needed some more
>         channels and more speed (I needed up to 100MHz, but this goes
>         up to 800MHz).
>         It can also generate waveforms.
>
>         https://store.digilentinc.com/digital-discovery-portable-logic-analyzer-and-digital-pattern-generator/
>         <https://store.digilentinc.com/digital-discovery-portable-logic-analyzer-and-digital-pattern-generator/>
>
>         It also works under Linux. Not nearly as pretty as Saleae, but
>         did the job.
>
>         It stores samples in the onboard 2Gbit DDR which limits the
>         sample depth to a 64Msamples or so.
>
>         What is really neat about the DigitalDiscovery is that it
>         comes with a C/C++ + Python API that allows you to program up
>         "test scripts" etc.
>
>         For example, I needed to capture data into files then run some
>         FFTs etc. All very easy, scripted and allowed me to re-run
>         tests etc without messing about clicking the UI hundreds of times.
>
>
>
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