GDSII Stream format is the standard file format for transfering/archiving 2D graphical design data. It contains a hiearchy of structures, each structure containing. Beyond that, let me say that the stream format is quite simple. I suspect that the people at Calma put a lot of thought into creating a file that. Learn files and view a list of programs that open them.
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Fule real bdsii used 4. This record must not be present if none of the fonts have a textfont file. Objects in the cell are assigned to “layers” of the design. Had 1 to 32 entries with group numbers, user numbers and access rights. Information about external data can be found in the CustomPlus User’s Manual.
In an AREF of course. However it is possible to save such large polygon in multiple blocks. Two-byet signed integer 2.
All About Calma’s GDSII Stream File Format
The first and last point of a boundary must coincide. The following data types are supported: Note that the data type gdzii. Max size 44 bytes. Bit 14 flags absolute angle. Since knowing the library structure without knowing about fild and data types would be of marginal use, and knowing about records and data types without knowing about the library structure would be worse, you might have to scan through this s few times before it makes sense.
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Maximum length is characters. The GDSII Stream format manual says that a record may be infinitely long, but frankly, I don’t see how it can get over bytes long, since the first two bytes of the record header are an unsigned integer that defines the length of the record.
The following is a list of record types. There is a section below with hexadecimal values of the various record types and a brief description of the types. This marks the beginning of a box element. If this record is omitted, then the element is not forma plex member. If omitted, a magnification of 1 is assumed.
Retrieved from ” https: Flrmat actual stream file: The reference library names may include directory specifiers separated with ggdsii Required for Filtered format, and present only in Filtered Stream files.
No data is present. This terminates the MASK records. I’m not sure if 0 is a valid plex group in a stream file. In the MASK list, data types are separated from the layers witha semicolon. The representation of negative numbers is the same as that of positive numbers, except that the highest order bit is 1, not 0.
The value of the boxtype must be in the range of 0 to If this record is omitted, then top-left justification and font 0 are assumed. I’ll show the subtraction in the formula below.
The first two bytes of the header contain a count in eight-bit bytes of the total record length. The data can be ifle to reconstruct all or part of the artwork to be used in sharing layouts, transferring artwork between different tools, or creating photo masks. This marks the beginning of a text element. This one gets a little more use. If this record is omitted, then all bits are assumed to be 0. Neither the number of columns nor the number of rows may exceed 32, decimal and both are positive.
The following records are not supported by Stream Release 3.
The sixth data type is the “Eight Byte Real”. Objects contained in a GDSII file are grouped by assigning numeric attributes to them including a “layer number”, “datatype” or “texttype”. ENDEL end of element.
GDS II (Calma GDS II)
An element shown in lower case means that name can be further broken down in to a set of record types. This marks the beginning of an array reference element an array of cells. Bit 15 rightmost specifies template data. This informationis used only when reading the data into a new library.
Speaking of dated, Stream Format allows records to be written out to multiple reels of tape. Also, there is a limit on the total amount of property data that hdsii be associated with any one element: By activating this option via gormat setup dialog or via a macro, all saved GDS II files will be padded to this length by adding a 0 at the end of the file.
NODE  No data is present. The value must be from 0 to This option is useful, if the mask vendor does not accept shapes other than polygons. If a character string is an odd number of bytes long it fkrmat padded with a null character. The following table summarizes the Bachus Naur symbols: Binary The database is binary for compactness.