GDSII FILE FORMAT PDF

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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The third formar is the record type. Validate File A file validation is performed after any save operation. Each X or Y coordinate is four bytes long. This moment was fittingly called tape out though it is not the original root of the term. The first two words, or four bytes, are called the “Record Header” A record can be as small as 4 bytes long.

Attribute numbers and are reserved for the user integer and user string properties, which existed prior to Release 3. This forat that the entire record is 4 bytes long. The elements within the braces can occur zero or more times. Contains four bytes which specify in database units the extension of a path outline beyond the last point of the path.

Values are 0, 3, 4, 5, and If this record is omitted, then the element is not a plex member.

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CHAPTER 1 GDSII format

It bdsii stored in twos complement format, with the most significant byte first. This means that all stream files should have an even number of bytes.

Since knowing the library structure without knowing about records and data types would be of marginal flle, 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. GDSII is an integer database. The basic unit gdsil measurement is a nanometer 10 -9 meter Since four byte signed integers are used to describe a coordinate then the integer coordinates can range from from minus 2 31 to plus 2 31 Each name is 44 bytes long and is null if there is no corresponding textfont filee.

An AREF has exactly three pairs of coordinates, which specify the orthogonal array lattice. To calculate the size of a user unit in meters, divide the second number by the first. Bits 12 and 13 specify the vertical presentaton 00 means top, 01 means middle, and 10 means bottom.

Bit 14 specifies external data also referred to as “exterior” data. This information is used only when reading the data into a new library. Some examples from the book: A string giving ranges of layers and datatypes separated by a semicolon.

You must subtract 64 to get the true value. This record must be present if any of the 4 fonts have a corresponding textfont definition file.

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Two- and four-byte signed integers use the usual twos complement format for negative values. The fourth, and last, byte in the record header is the data type. The default setting is A text or SREF element must have only one pair of coordinates.

The third data type is a “Two-Byte Signed Integer”. The value of the node gdsi must be in the range of 0 to The length of this string is always equal to the length of the record minus the four bytes used for the record header.

The third byte of the header is the record type also known as a “token” shown below, and the fourth byte is the data type. Exactly 1 pair AREF: This is not part of the GDS standard, but supported by some ifle. Various companies including Artwork have developed their own gdsii binary-ascii converters for those who wish to use tools such as Perl, awk or Python to manipulate GDSII data. Bit 13 flags absolute magnification.