Logic Analyzer and WaveForms: How does bus and clock work?

[LarsB]

Before buying a Digital Discovery, I decided to try out WaveForms first.  But as WaveForms doesn't provide any mock data, I cannot really confirm that my main use case is covered.

Suppose I define an 8-bit Bus DIO 0 to DIO 7 and set one of its signals DIO 0 as clock with rising trigger.  Does the clock signal become part of the bus value?  In other words, if DIO 1 through DIO 7 are constant HIGH and DIO 0 pulses, are the values shown in the data tab hFF or hFE?

If the clock signal is included in the bus value (hFF), is there any way to separate the clock signal from the bus?

[attila]

Hi @LarsB

You could use the Sync capture. In this mode the sampling condition is executed in the device.

 

You could also sample all signals (including clock) and decode it in the software using the Bus clock, delay, enable...
Regarding the MSB/LSB indices, by changing these you could decode to fractional numbers.

 

[LarsB]

Also, why are there Bus options to set the MSB and LSB if I cannot choose a smaller range that doesn't encompass all the signals?  What's the point?

If I could exclude a signal by narrowing the LSB/MSB range then that would solve my Bus and Clock problem described before.

What I understand by now is that I need to define a Custom "signal" that removes the Clock signal from the Bus value, but couldn't that be easier to begin with?

[LarsB]

Thanks, Attila, those are excellent suggestions!  In fact, I didn't realize that the clock of a bus could be an extra signal not belonging to the bus! *duh*

But I have a silly question: Is is actually possible to use/generate mock data in demo mode, e.g., like the counter in your example?  This would allow me to really test those features.  Whenever I press Record or Run in demo mode, I only get 0s for data ...

[attila]

Hi @LarsB

In demo mode only basic functions are simulated like the earlier simple capture but sync mode is not working, record may work.

[LarsB]

Well, I've seen enough to submit my order!  ?  Thanks again.