4 - Hierarchical Design
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Abstract:

Publisher SummaryThis chapter explores schematic capture beyond basics and illustrates its power by creating a hierarchical schematic and then using post-processing tools to generate a Bill of Materials. Creating a hierarchy entails placing three hierarchical blocks, adding hierarchical pins for the signals, and interconnecting these pins with wires. Hierarchical pins are the entry and exit points for signals that run between hierarchical blocks. Power and ground are automatically interconnected between all schematics in a hierarchy, unless measures are taken to isolate them. The Place Hierarchical Pin tool on the tool palette is used to place pins. Hierarchical blocks are interconnected through wires and/or buses to hierarchical pins. Wires must run to the connection squares on the pins. Hierarchical ports are used for the sole purpose of routing signals onto and off schematic pages in a hierarchical design. All information related to a design is collected and organized in a Capture project. A project may contain only one design. The design must have a root schematic. In a hierarchical design, all other schematics must branch out from the root schematic. Post-processing tools consists of Cross Reference Parts and Bill of Materials. The Cross Reference Parts tool generates a part of cross-reference report. This chapter presents a report that is helpful in locating certain errors in parts usage and reference designator assignments. The Bill of Materials tool generates a bill of materials report. A bill of materials report is one of the basic documents required to manufacture a product. Capture provides a basic text editor that can be used to edit report files. It also provides an Archive Project command on the File menu that can be employed to back up a project onto floppy disk or other media.

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