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lef unit confusion

Holdsworth
Hello there, I'm a bit confused with LEF unit: I've a LEF file with DATABASE MICRONS 2000 ; However, the LEF/DEF language reference interprets one LEF distance unit as multiplied when converted into database units. In other words, if for a LAYER M1 WIDTH 0.10 ; , does this mean that the actual width of M1 is (0.1*2000)um ?
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  • Kari

     No, the M1 width is 0.10 microns. The numbers in the LEF are always in microns, but the tech LEF also happens to be where you specify what the DB Units are for the design. The numbers in the DEF file are in DB Units. The statement DATABASE MICRONS 2000 means that for any numbers in the DEF file, to convert to microns, you divide by 2000. (A long time ago, the tool GUIs would display things in DB Units also, but I believe everything is displayed in microns now.)

    Sometimes the LEF will have DATABASE MICRONS 1000, or some other number. It depends on the technology and what the manufacturing grid is.

     

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  • Kari

     No, the M1 width is 0.10 microns. The numbers in the LEF are always in microns, but the tech LEF also happens to be where you specify what the DB Units are for the design. The numbers in the DEF file are in DB Units. The statement DATABASE MICRONS 2000 means that for any numbers in the DEF file, to convert to microns, you divide by 2000. (A long time ago, the tool GUIs would display things in DB Units also, but I believe everything is displayed in microns now.)

    Sometimes the LEF will have DATABASE MICRONS 1000, or some other number. It depends on the technology and what the manufacturing grid is.

     

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