Page-wise Operation -
Multiple linear chirping waveforms can be loaded by utilizing
page-wise operation. This function divides the DSM memory into several shorter sections, or pages, onto
which you can load different waveforms. Page-wise operation permits convenient switching between various linear chirping
waveforms with different parameters.
One waveform can be stored on each of
up to 7 pages, with the Data Length of each page
limited to 10000 (hex). Waveforms with longer Data Lengths will be truncated.
» Start by following the same procedure as for loading pre-stored waveforms. With the program open, click on the Waveform tab if you are not already in the Waveform Panel.
» Click on the pull-down bar and select one of the saved waveforms. After clicking
on the waveform, waveform parameters in the file will be loaded into the GUI. You can modify the parameters here.
» Next, to access the paging function, type one of the following
waveform codes: 253,
254, or 255,
corresponding to negative, triangle, or positive linear chirping
in your selected waveform, into the
Waveform Code box and press the Enter key.
» A Page Control slider bar will appear in the Waveform Panel. Seven pages, numbered
0 through 6, are available. Select a page by moving the page control bar.
» Then click the Download button to send current waveform parameters to the board.
You will have to click Download whenever you change the waveform parameters.
» Before proceeding with anything else, you must wait for the waveform to finish downloading to the board. This can take
several seconds, requiring longer durations to download waveforms with longer Data
Lengths. You can monitor the download completion status indicated by the progress
bar at the lower right corner of the application window.
» Please do not restart the waveform yet, until after you have finished downloading all the intended pages.
» At this point, you may want to save the waveform. This will save your waveform parameters, including the page number associated with the waveform, so that you can recall the waveform quickly in future uses of the DSM.
» Repeat the preceding process for each page until exhausting the seven pages or having finished downloading all of your intended linear chirping waveforms.
- choose a pre-stored waveform (or keep the same waveform if desired)
- modify chirping parameters if desired
- enter the appropriate corresponding paging waveform code (253, 254, or 255)
- select a new page with the Page Control slider
- download to the board, waiting for the data to finish downloading.
- save the waveform if desired.
» Finally, to start the waveform, press the Restart button in the toolstrip under the menu bar near the top of the application window.
Please note that the status of checkboxes for Marker Polarity and Marker Enable
apply to all pages.
To help you keep track of the various parameters downloaded onto each page, click the green Tracking
Waveform Summary button in the Toolstrip under the menu bar to view a pop-up window with
a summary of the parameters on each page.
This summary shows the parameters last downloaded to the module.
When the last downloaded
waveform used codes 253, 254, or 255 (that is, it utilized the page-wise operation
feature, such as in the preceding steps), the tracking waveform summary will also
display
the parameters downloaded on other pages.
» To switch between the waveforms you have already downloaded onto the various
pages, slide the page selection bar.
To recall saved waveforms, such as after you have exited and then returned to the
GUI application, please select the prestored waveforms
from the pulldown Waveform Selector in the Waveform Panel and download them to the board, one-by-one, remembering to wait several seconds after each one to finish
downloading to the board, and then finally restarting
the waveforms.
Example of page-wise operation
Here we shall illustrate an example of page-wise operation, consisting of three pages. All values assume an input clock frequency of 2 GHz. The three pages we shall use are already saved in your waveform directory:
- 100 MHz - 200 MHz positive linear chirp in about 5.1 µs (pw-1.wf)
- 500 MHz - 400 MHz negative linear chirp in about 10.2 µs (pw-2.wf)
- 700 MHz - 800 MHz triangular linear chirp in about 15.3 µs (pw-3.wf)
First choose "100-200 MHz page-wise positive (pw-1.wf)"
from the Waveform Selector pulldown menu.
Click the Download button, and wait briefly for the waveform data
to download to the board.
Next, choose "500-400 MHz page-wise negative (pw-2.wf)" from the Waveform Selector
pulldown menu.
Click the Download button, and wait a few seconds for the waveform
data to download to the board.
Third, choose "700-800 MHz page-wise triangular (pw-3.wf)" from the Waveform Selector
pulldown menu.
Click the Download button, and wait a few more seconds for the
waveform data to download to the board.
Now click the Restart button, and you can view the waveforms on your
oscilloscope and/or spectrum analyzer.
You can use your mouse to slide the Page Control slider bar between pages 0, 1,
and 2 to quickly shift between each of the waveforms.
You can also modify the chirping parameters and pages if desired, re-download the new data
to the board, and then restart the waveforms after waiting for the data to finish
downloading. Please remember that the Data Length should be a multiple of 4 and
should be no more than 10000 hex for page-wise operation.
To help you remember what parameters are stored in each page, please click the Tracking Waveform Summary button to view a pop-up window displaying the parameters.
