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Not able to generate the antenna info for hard blocks

tswong

I've done the steps below to generate the antenna info on abstract generator, but it is fail so far..

1) define the thickness and defaultantenna rule for electricalRules section on techfile.

2) turn on the signal tab of Extract step

3) define "drain" and "gate" for antenna calculation

There is no error message during the generation, but it is still not able to find any antenna information at the exported LEF. I am not sure whether anything is missed. I wonder anyone could give me advise! 

Parents
  • Hi TS

    You need to define the layers that make up antenna regions "gate" and "drain" so that abstract generator can know the area of gates and diffusion. Otherwise, it would not be possible for it to give parameters such as "ANTENNAGATEAREA". : )  The antenna layers need to be assigned so that abstract generator knows the area and type of metals that are connecting to the gate and diffusion.

    I think your inputs for antenna regions and calculations looks ok. You should not have any problems now. There are indeed some changes in antenna info between lef5.4 and 5.5. I do not have all the details but if you look at $CDSHOME/doc/lefdefWN5.5/lefdefWN5.5.pdf, you will find that pg18 states that ANTENNASIZE section has been removed in lef5.5. This section used to contain ANTENNAINPUTGATEAREA, ANTENNAINOUTDIFFAREA and ANTENNAOUTPUTDIFFAREA parameters.

    Best regards
    Quek
Reply
  • Hi TS

    You need to define the layers that make up antenna regions "gate" and "drain" so that abstract generator can know the area of gates and diffusion. Otherwise, it would not be possible for it to give parameters such as "ANTENNAGATEAREA". : )  The antenna layers need to be assigned so that abstract generator knows the area and type of metals that are connecting to the gate and diffusion.

    I think your inputs for antenna regions and calculations looks ok. You should not have any problems now. There are indeed some changes in antenna info between lef5.4 and 5.5. I do not have all the details but if you look at $CDSHOME/doc/lefdefWN5.5/lefdefWN5.5.pdf, you will find that pg18 states that ANTENNASIZE section has been removed in lef5.5. This section used to contain ANTENNAINPUTGATEAREA, ANTENNAINOUTDIFFAREA and ANTENNAOUTPUTDIFFAREA parameters.

    Best regards
    Quek
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