DATABASE MICRONS in the Exported LEF File

You can use one of the following methods to set the correct DATABASE MICRONS values in the LEF file exported from Abstract Generator:

• Import a technology LEF file to create a technology file
  If the imported technology file contains the following statement:

  UNITS 

      DATABASE MICRONS 1000  ; 

  END UNITS

  it will be used by Abstract Generator and will be output to LEF created by Abstract Generator. In OpenAccess, DATABASE MICRONS is output to the technology LEF only.
• Manually edit the value in the technology file in Virtuoso Studio design environment
  In OpenAccess, the DATABASE MICRONS value is taken from the database units per user unit (DBUPerUU) value defined in the technology file. A sample of the OpenAccess technology file is shown below.
  On CDB, the value for DBUPerUU for each cellview type can be stored in multiple locations in the technology file, such as the prop.xx file, attached technology file, and .cdsenv file.
  On OpenAccess 2.2, the database units per user unit (DBUPerUU) is stored at a single location in the technology file — viewTypeUnits subsection of the controls section.
  Example

  controls(
   viewTypeUnits(
   ;( viewType            userUnit       dbuperuu           )
   ;( --------            --------       --------           )
  
    ( maskLayout          "micron"        2000            )
    ( schematic           "inch"          160             )
    ( schematicSymbol     "inch"          160             )
    ( netlist             "inch"          160             )
   ) ;viewTypeUnits
  ) ;controls

  After changing the value of dbuperuu, recompile and save the technology file by using the Technology File Manager. If you want to use this updated technology file in an open Abstract Generator session, you will need to re-open the library to force the application to re-read the updated technology file (File – Library – Open).

Related Topics

Exporting LEF in Abstract Generator

Read-Only Technology File in Abstract Generator

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