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Caltech Intermediate Form (CIF) is a file format for describing integrated circuits. CIF provides a limited set of graphics primitives that are useful for describing the two-dimensional shapes on the different layers of a chip. The format allows hierarchical description, which makes the representation concise. In addition, it is a terse but human-readable text format. == Overview == Each statement in CIF consists of a keyword or letter followed by parameters and terminated with a semicolon. Spaces must separate the parameters but there are no restrictions on the number of statements per line or of the particular columns of any field. Comments can be inserted anywhere by enclosing them in parentheses. There are only a few CIF statements and they fall into one of two categories: geometry or control. The geometry statements are: LAYER to switch mask layers, BOX to draw arectangle, WIRE to draw a path, ROUNDFLASH to draw a circle, POLYGON to draw an arbitraryfigure, and CALL to draw a subroutine of other geometry statements.The control statements are DS to start the definition of a subroutine, DF to finish thedefinition of a subroutine, DD to delete the definition of subroutines, 0 through 9 toinclude additional user-specified information, and END to terminate a CIF file.All of these keywords are usually abbreviated to one or two letters that are unique. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Caltech Intermediate Form」の詳細全文を読む スポンサード リンク
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