When I create a symbol so that I can inc

Question

< Stefan Schippers> When I create a symbol so that I can include an extracted netlist how can I match the port order to that of the extracted netlist

Harald Pretl · Answer

Ah `sim pinnumber` seems to do the trick I ll try that

Mitch Bailey · Answer

< Harald Pretl> There s a discussion here about setting the order of ports in the extracted netlist

Harald Pretl · Answer

Thanks good pointer I have now matched the `xschem` symbol to the extracted netlist port order using the `sim pinnumber` property

Stefan Schippers · Answer

Good you got it right Anyway the tutorial page is <https xschem sourceforge io stefan xschem man tutorial use existing subckt html|here>

Stefan Schippers · Answer

Instead of specifying pinlist in the symbol format string as in `format= name pinlist symname ` you can set the netlist rule as follows assuming a symbol with 3 pins A B Z `format= name Z A B symname ` The first rule relies on the creation order of the pins first drawn goes first This order of course can be changed as explained in the tutorial but explicitly naming the pin order using the x syntax is probably the simplest method to match a aymbol with an existing netlist

Harald Pretl · Answer

< Stefan Schippers> is there a way to grab the pinlist from the included extracted spice netlist There is a small risk that after the next extraction the pin order changes and this goes undetected An automatism would be much safer

Iain Waugh · Answer

< Stefan Schippers> the tutorial here link you posted above points to a local file URL Is there one on the net

Stefan Schippers · Answer

Sorry I have corrected above post The link is <https xschem sourceforge io stefan xschem man tutorial use existing subckt html>

Stefan Schippers · Answer

< Harald Pretl> This requires xschem to look into the extracted netlist produced by another tool It is possible to use a hook script that generates the `format` or better `lvs format` specifically for lvs matching netlisting rule but to make this flow robust some convention must be adopted what netlistfile to look into etc

Harald Pretl · Answer

< Stefan Schippers> What would work maybe I implement this in the future A script given the `xschem` symbol file and the extracted netlist could parse the extracted netlist and based on the pinorder in the extracted spice netlist adjust the `sim pinnumber` property of an already existing handdrawn symbol While doing it can check for matching of the pins between these two entities spice and sym and report and error An autocreation of symbol from spice netlist I think is not that important as usually one starts with a symbol plus something behind for first simulation and later replace it by an extracted netlist