Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide 1 Cell Wide (Y Min = 1) { 2 Cells Wide (X Min = 2) 4 Cells { 8 Cells 2 Cells 4 Cells Y Cell Size = X A portion of circuit metal showing how em combines cells into subsections for Manhattan polygons when X Min = 2 and Y Min = 1. If X min or Y min are greater than your polygon size, em uses subsections as large as possible to fill the polygon. NOTE: The subsection parameters, X Min, Y Min, X Max and Y Max are specified in cells (not mils, mm, microns, etc.). For example, X Min = 5 means that the minimum subsection size is 5 cells. Although the X Min and Y Min parameters are very useful options, it is not a substitute for using a larger cell size. For example, a circuit with a cell size of 10 microns by 10 microns with X Min = 1 and Y Min =1 runs faster than the same circuit with a cell size of 5 microns by 5 microns with X Min = 2 and Y Min = 2. Even though the total number of subsections for each circuit may be the same, em must spend extra time calculating the value for each subsection for the circuit with the smaller cell size. 38
Chapter 3 Subsectioning X Min and Y Min with Edge Mesh On Having the edge mesh option “on” is the default state for Sonnet projects because it provides a more accurate analysis. Having edge mesh “on” for a polygon changes how the subsections on the very edge are handled. Starting from the left side of the previous example with edge mesh off, the subsections were 2 cells, 4 cells and 8 cells wide. With edge mesh on, the subsections for the same polygon would be 1 cell, 4 cells, and 8 cells as shown in the illustration below. Notice only the outermost edge is affected. 1 Cell by 1 Cell on corner 4 Cells (2 * X Min) Y Cell Size = X A portion of circuit metal showing how em combines cells into subsections for polygons with edge mesh on, with X Min = 2 and Y Min = 1. Edge mesh polygons always have 1 cell wide edge subsections. As mentioned in the previous section, the edge mesh setting only affects Manhattan polygons (i.e. those with no diagonal or curved edges). Edge mesh is always “on” for non-Manhattan polygons, regardless of the edge-mesh setting for that polygon. 39
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