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How can I get the DC Voltage of a specific net name via skill code?

CADcasualty

As shown in the diagram, I have made a small 1-pin annotation cell that simply displays the cdsTerm voltage of it's only pin. I would like to augment it's display capability such that if, via a parameter, I give it the net name of a supply net (i.e. VDD5! in this case) that it will display logic level information instead (i.e. H, L or X). I believe I can figure out how to deal with the code to display what I need, but what I can't figure out is how get the voltage on the net VDD5! that I provided to the annotation cell. Also, it's possible the VDD5! net label might not even specifically exist on the current schematic because it's a global. 

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  • You can't really do that, because cdsTerm only works looking up a specified terminal name on whatever ilInstPath is set to. Accessing an arbitrary net gets you into the whole challenge of needing access to the window being redrawn so that you can find the net, and so on.

    Andrew

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  • You can't really do that, because cdsTerm only works looking up a specified terminal name on whatever ilInstPath is set to. Accessing an arbitrary net gets you into the whole challenge of needing access to the window being redrawn so that you can find the net, and so on.

    Andrew

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  • in reply to Andrew Beckett

    Hi Andrew. I tried another approach to this. At the top level of my schematics I define a voltage source that is connected to the VDD5! node shown in the diagram. That source is configured via a variable called VDD so I added parameters for high_threshold (2/3*VDD) and low_threshold (VDD/3) to my annotation cell and then used your fancy abIPar procedure to get the value. It works great. The only annoyance is that it needs to know the current window ID (an issue that seems to be plaguing me a lot these days), but until that's fixed I can live with doing the additional redraw commands. 

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