SEMI P39 - '''OASIS<sup>®</sup> (Open Artwork System Interchange Standard- SEMI P39)''' (OASIS<sup>®</sup>) is aan integrated circuit design and mask layout binary file format used as a cell and chip level representation and expression of physical (mostly geometric) layout data. The format represents layout data found in cell Libraries and represents data used in chip-level physical and mask layout design and manufacturing. TheGenerally, the data within an OASIS file is organized by cell with, in some instances, lower-level references to other dependent cells. At the cell Library level, the layout for each cell is represented independently from the other cells within the Library. Ideally, all cell layout data is based on foundry-verified process data. There may be hundreds of thousands of cells within one Library. Typically, within a cell Library, there will be one OASIS data file for each cell. The cell Library may also contain a single merged OASIS file encapsulating all cells.
A cell can be a simple (NAND, OR, XOR, etc.) logic circuit or it can comprise as much as the entire functionality for an embedded microprocessor. The content of the cell is arbitrarily defined according to its anticipated use when connected with other cells during logic design. Mostly, a Library OASIS<sup>®</sup> file contains layer-by-layer transistor-level geometric (polygons) and non-geometric data that represents how, at the cell level, the cell should be manufactured. Not all cells within a cell Library are used in a single design.
