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GDSII Format Overview

Get insights into the GDSII file format, including records, creation process, structure details, and examples for graphical design data storage and transfer.

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GDSII Format Overview

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  1. Data Structures مرتضي صاحب الزماني

  2. Corner Stitching مرتضي صاحب الزماني

  3. Corner Stitching • Advantages: Easy changes. • Many basic operations in O(# of neighbors) • (worst case: O(n)) • Number of pointers = 4 independent of number of neighbors. x y tr height rt width bl Text (name) lb مرتضي صاحب الزماني

  4. or Point Finding مرتضي صاحب الزماني

  5. Point Finding (Example) مرتضي صاحب الزماني

  6. Point Finding Algorithm B: current block x,y: destination point or (x < B.x) or (x > B.x + B.width) is optional. مرتضي صاحب الزماني

  7. Neighbor Finding • همة tileهايي را که با ضلع مشخصي از tile مورد نظر تماس دارند بيابيد. • الگوريتم (براي سمت راست): از اشارهگر tr با استفاده از lbهاآنقدر پايين بيا تا به tileي برسي که اصلاً در محدودة عمودي tile اوليه نيفتد. مرتضي صاحب الزماني

  8. Block Insertion مرتضي صاحب الزماني

  9. Block Deletion مرتضي صاحب الزماني

  10. Layout Description Language CIF (Caltech Intermediate Form) Box: B width height center direction default: (1, 0) Polygon: P path Wire: W width path Layer: L layername User command: number usercommand Call: C symbol transformation DS symbol DF مرتضي صاحب الزماني

  11. GDSII Format • GDSII (Graphics Database Systems): • Stream format • Standard file format for transferring/archiving 2D graphical design data. • Binary format • Platform independent • because it uses internally defined formats for its data types. • Hierarchy of structures: • Boundary • Path • Text • box • Structure references (SREF) • Structure array references (AREF) مرتضي صاحب الزماني

  12. GDSII Records • The GDSII format is a sequential list of records: • Some records: مرتضي صاحب الزماني

  13. GDSII Example # KEY file for GDS-II # File = example.key # ==================================================================== HEADER 5; # version BGNLIB; LASTMOD {98-8-25  15:53:12}; # last modification time LASTACC {98-8-25  15:53:12}; # last access time LIBNAME TEMPEGS.DB; UNITS; USERUNITS 0.01; PHYSUNITS 1e-08; BGNSTR; # Begin of structure CREATION {98-8-25  15:53:12}; # creation time LASTMOD  {98-8-25  15:53:12}; # last modification time STRNAME AAP; BOUNDARY; LAYER 1;  DATATYPE 0;    XY 5;    X     -920000.000; Y      452000.000;   X      656500.000; Y      765500.000;    X      175000.000; Y     -174000.000;   X     -756000.000; Y     -198000.000;    X     -920000.000; Y      452000.000; ENDEL; ENDSTR AAP; BGNSTR; # Begin of structure CREATION {98-8-25  15:53:12}; # creation time LASTMOD  {98-8-25  15:53:12}; # last modification time STRNAME LAYOUT; BOUNDARY; LAYER 0;  DATATYPE 0;    XY 5;    X    -2032000.000; Y     1410000.000;   X     1427000.000; Y     1666000.000;    X      502000.000; Y    -1580500.000;   X      502000.000; Y    -1523500.000;    X    -2032000.000; Y     1410000.000; ENDEL; مرتضي صاحب الزماني

  14. GDSII Example (continue) BOX; LAYER 2;  BOXTYPE 0;    XY 5;    X     1526500.000; Y    -1034500.000;   X     2623500.000; Y    -1034500.000;    X     2623500.000; Y     1105500.000;   X     1526500.000; Y     1105500.000;    X     1526500.000; Y    -1034500.000; ENDEL; SREF; SNAME AAP; STRANS 0,0,0;    XY 1;    X    -1112500.000; Y    -1267000.000; ENDEL; PATH; LAYER 3;  DATATYPE 0;WIDTH 100000;    XY 4;    X      891912.000; Y     2322024.000;   X      966537.000; Y     1854278.000;    X     2599515.000; Y     2311647.000;   X     2626485.000; Y     2005353.000; ENDEL; TEXT; LAYER 3; TEXTTYPE 0; PRESENTATION 0,2,0; PATHTYPE 1; STRANS 0,0,0; MAG 1875;    XY 1;    X    -2256500.000; Y     1539500.000; STRING "Boundary"; ENDEL; مرتضي صاحب الزماني

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