Creating LISA Scripts to Automate Layout Operations in
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1. seg_output E num_cont cont_Op6 size DISPLAY num_cont IF cont_Op6 size NEQ 0 THEN BEGIN jel LOOP BEGIN select Object cont_Op6 j pt cont_Op6 j position DELETE SELECTION instance pt x pt y cell cont_O0p4 j jtl F j EQL num_cont 1 THEN leave loop END lend of loop to delete 0 6um contact and replace lwith cont_Op4 instance END lend of condition where num_cont gt 0 in a cell cell close ae A ae E F 1 EQL cells size THEN leave loop END Figure 4 Contact Replacement XI Script The example of the find objects command used in Fig ure 4 can be modified to apply to any number of tasks that require searching through a large layout cell or an entire layout database to find specific layout objects in cluding shapes wires text and instances that match a series of user defined search criterion Conclusion Creating XI scripts with LISA code is an economical way to perform systematic and repetitive layout functions in Expert The two examples shown above illustrate how several basic LISA commands are used to create proce dures that automate design tasks that would be very time consuming if done manually Investing a small amount of time to create an XI script that can be reused throughout a project and even migrated to future projects can have a substantial impact in reducing the cycle time of the layout phase of a design Application Note 2 0092. line with text labels cell_name array_top cell open cell_name LOOP BEGIN lbit line loop IF bl_num EQL cols THEN leave loop text Xorg bl_num bl_pitch Yorg 3 bl_ amp bl_num height 2 width 0 8 bottomcenter layer metall bl_num bl_num 1 END lend of bit line loop LOOP BEGIN lword line loop IF wl_num EQL cols THEN leave loop text Xorg Yorgt twl_num wl_pitch wl_ amp wl_num height 2 width 0 8 bottomright layer poly wl_num wl_numt 1 END lend of word line loop Figure 2 Text Labeling XI Script Page 1 Se USEN NSSSSSS8 W gt SE SS Ny NN S SSSSSSS Sam Te LT NSSS NS ASYSTY N NANY m mme ANE Was LJ N i _ O N S VY NS NVL NNINVS NS NSV SSN NNN WINN SS JY NSI AN NSX NS l NSN NN NA PA A NAN NA SS i RN TREN A ILa z ammen pn NS NV TOS RAN SS ma SSNV NSN NY Bi ALn GA N E Re By ae Saaz ix Figure 3 Layout View of Labeled Pe Next is the LOOP BEGIN statement that will loop through each of the bit line columns and place a text label on the metal1 vertical bit line The text begins as bl_O and is incremented each time through the loop The same procedure is used to place text labels on the rows of poly word lines A close up view of the resultant layout is shown in Figure 3 Contact Search and Replace Example Script The second example XI script performs the task of resiz
3. Application Note Creating LISA Scripts to Automate Layout Operations in Expert Introduction Many layout design tasks in Expert can be automated us ing the LISA command language Creating LISA Expert Interface XI scripts for repetitive manual tasks can re duce project time and increase layout quality by reducing the chance of manual layout errors Since Expert menu commands can be replicated using LISA commands an XI script can be created to automate almost any layout task Once written these scripts can be quickly modified for use in different design projects including ones with different technology process nodes Two XI script examples are provided to show how short LISA scripts can perform layout operations that would be very time consuming if done manually These examples contain several basic LISA commands that can be ap plied to various tasks that may arise during the layout phase of a design project Creating a LISA XI Script Expert has a built in XI script editor that can be opened using the following menu selection Tools gt gt XI Script gt gt Script Panel shown in Figure 1 The Expert User Manual contains a chapter devoted to XI scripts and provides the syntax to access Expert functions using LISA com mands Once a script is written it can be executed by clicking the Run icon on the Script Panel tool bar or by selecting Script gt gt Run in the menu Expert 4 4 20 build 1325 ndl_ex File Ce
4. ing contact shapes in a layout database by searching for any contact shape of a certain size and replacing that shape with an instance of a layout cell containing the new contact The code for this example is found in Figure 4 A list of all cells in the currently loaded layout database is stored in the array variable cells by using the get_li brary_cell_list command Then a loop is created that iterates through each of the entries in the cells array variable and performs a search for all drawn contacts of 0 6um size by using the find objects command with specific search criteria A second nested loop begins if the find objects search results has a size greater than zero indicating that a 0 6x0 6um contact was found in the cell Inside the loop the Select Object command selects each shape that was found and deletes it By us ing the stored X and Y position values returned by the search an instance of a contact that is the correct size of 0 4um is placed at the origin of the deleted shape Page 2 SIMUCAD Script to replace a flat contact shape with an instance of a smaller contact get_library_cell_list store all cells in array cells loop through all cells cell open cells i DISPLAY cells i cont_Op6 find objects SEARCH_BOX eriteria search_criterion_create OA_LAYER contact EQ search_criterion_create OA_SIZEX 0 6 EQ search_criterion_create OA_SIZEY 0 6 EQ
5. ll Edit View Select Tools Hierarchy Verification Libraries PCell Setup Window Help G B B8a OME Hw S el Wis Q 1 fl A 8 Script Panel x 18 3950 Cross Sectional Viewer Netlist Driven Layout xi Xi Command Line X DF Expert Log Placer Compactor Return R Cut By Line Cut By Line Modes Cut By Vertices Count Figure 1 Accessing the XI Script Panel Application Note 2 009 Memory Array Text Labeling Example Script The first XI script example shown in Figure 2 is a short LISA script that opens a user specified layout cell con taining an array of memory cells and places incremented text labels on the memory bit line and word line signal paths The use of text labels on signal nodes can greatly improve LVS debugging but the placing of these labels on large arrays found in memory designs would take a prohibitive amount of time if done manually The beginning of the script defines the variables that will be used later in the code After the variable definition statements the script uses the cell open command to open the memory array layout that will be edited This script does not load the project database eld file and so it is left to the user to load the database before executing the script The eld file can be loaded in the XI script us ing the following command syntax PROJECT LOAD proj name tech name outputname output name readonly This script labels row and column bit line and word
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