As edge rates increase, signal intergrity (SI) becomes more and more important, even for the hobbyist. Unfortunately, the models provided by semiconductor vendors typically come in only 2 forms, encrypted HSPICE and IBIS. No open tools exist for handling either. An open HSPICE decryption utility would only either encourage encryption changes or take-down notices.
Enter Darter, a tool for creating SPICE models based on IBIS models. The basic idea is to create a SPICE subcircuit for each IBIS model within an IBIS file. Each subcircuit is then wrapped in one of several different subcircuits depending on component and pin (or signal name). This gives subcircuit names like (note that spaces in the model name get converted to underscores): DQ_FULL_ODT50_800 for bare buffers and: MT47H128M16U69A_DQ_FULL_ODT50_800_DQ14 for a buffer with parasitics. The buffers can then be connected with transmission lines for simulating SI problems. https://gitorious.org/darter http://www.gedasymbols.org/user/russell_dill/darter.html _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
