Capturing Data

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Once signals and triggers are defined, you can capture a new buffer of data at any time by pressing the 'Run' or 'Auto Run' buttons. If you tire of waiting on a trigger or the Analyzer triggers but you tire of waiting for its buffer to fill, you can manually STOP the capture to transfer the buffer. When transferred to the screen, the capture is also stored in the capture history for later analysis (based on Acquisition settings).

 

If you have little or no activity after the trigger condition and find the need to manually halt the capture frequently, you may want to set a timeout period for automatic halt and transfer (see Acquisition settings) or reduce the Analyzer's buffer size (see Analyzer Buffer).

 

 

runbar001

 

previewbutton        Preview - This mode will automatically transfer data to the PC repeatedly even if a trigger condition has not been defined. This mode is very useful to Monitor signals while making connections and only utilizes a small portion of the hardware buffer. In this mode, the buffer size and duration of data collection is adjusted automatically to provide a "peek" of the logic activity and is not intended for normal data analysis. The result is a virtual "LIVE" mode that does not try to search the data (Auto Search windows) or store the data in the capture history. The data displayed will be discarded when the results of a normal Run (single shot) or Auto Run are displayed.

 

autorunbutton        Auto Run - This will "ARM" the hardware, wait for the trigger condition, automatically transfer the data to the PC when the buffer is full and  automatically re-arm to repeat the process until the Stop or Halt button is pressed. If you are waiting on a Trigger condition that you expected to occur, you can select the "Stop" button to view the data already collected in the pre-fill portion of the hardware buffer (see Analyzer Options).

 

runbutton        Run - This will "ARM" the hardware and automatically transfer the data to the PC when the buffer is full. If you do not want to wait for a long capture, you can select the "STOP" button to force a transfer of the current data captured. If you are waiting on a Trigger condition that you expected to occur, you can select the "Stop" button to view the data already collected in the pre-fill portion of the hardware buffer (see Analyzer Options).

 

stopbutton        Stop - This will halt the capture and transfer whatever was captured to the PC for your analysis. 

 

haltbutton        Halt - This will reset the hardware and abort the capture without changing the data currently being analyzed. When the halt button is pressed, no data is transferred to the screen or the Capture History.

 

When you click on 'Run' (or Auto Run), you are actually arming the trigger circuit.  Upon trigger, the hardware allows the buffer to continue past the pre-fill point and to continue filling up (post-fill).  Once the buffer is full, it is transferred to the PC.  After the buffer is transferred, the hardware immediately resets and begins pre-filling in preparation for the next RUN. In Auto Run mode, the next Run starts automatically.

 

Capture related topics:

 

Hardware Status
Capture History
Status Window
Capture Troubleshooting

 

 

Note that the DigiView hardware is always capturing and storing data in a circular queue. While you are looking at the last capture, the hardware is pre-filling the buffer to the pre-fill size selected. When the buffer reaches the pre-fill setting, the hardware continues capturing and storing data in a circular queue fashion so that the most recent data is always available while waiting on the trigger condition.

 

 

(see also: Acquisition Options, Analyzer Options, DigiView Compression)