| OCR Text |
Show 7 clocks of their largest circuits run at 33 to 40 MHZ. Another large American manufacturer of microprocessors does exhaustive parasitic analysis, and their largest circuits run at 200 MHZ with approximately the same CMOS technology. A quantifiable estimate of internodal capacitance between paths on the same layer minimally needs values for the separation, the widths, and the path thicknesses. For different layers there are the combinations of the different path materials, the separations between them, and the different ways of being in proximity. An examination of IC layout that has been hand-crafted reveals quite a variety of interactions besides those of parallel paths. There are, for example, corner interactions, overlaps, crossings, contacts, and vias. These introduce other capacitance problems that use such parameters as distance between edges, vertices and centerlines, and need widths, areas, and common lengths. ACRE lets a user control the resolution for solving these interactions. The Programmatic Approach ACRE approaches the problem of determining internodal capacitance and resistance with a custom language designed for a terse expression of analysis and simplification methods. It is an object oriented interpreted language with a debugger, a facility to read stream data or CIF data, a database utility, and a table or graph interplolater. It has optimizations to analyze pairwise data easily and produce formatted output. The performance optimizations provide for all compute intensive aspects to be performed in compiled code, while control flow remains at the interpreted layer. |
