Black Box IEEE 1284 Podręcznik Użytkownika Pobierz pdf (Strona 54)

Page 54 of 98 The Black Box Toolkit

We do this by selecting either of the lines we wish to be active and then add them by

clicking on the “Add SPM PV” button. We must do this after defining the state of each of

the four lines – we would need to ensure line 3 was set to off! If we selected line 1 and line

3 to be “On” and then added them this would mean we wanted both lines to be active

rather than either OR. In short this would AND them together as shown below.

As can be seen this combination gives different port values and as a result DSCAR would

be looking for a different stimulus to respond to. In the first example this would be a bitmap

OR a tone. In the second a bitmap and tone at the same onset. In the latter case a

response would only be made when both stimulus types (or lines) were perfectly

synchronised and active. When DSCAR runs all stimulus and response activity is logged

into a Real Time Log file for later analysis.

Once we are happy with our definitions we can save the sequence to disk, close the

design-time version of DSCAR and switch to the runtime version using the toolkit menu.

The runtime version of DSCAR is shown below.

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Black Box IEEE 1284 Podręcznik Użytkownika Strona 54