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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

  • Quek,

     I think we have moved a big step, some antenna info can be generated, But I am still confuse about the usage of "Layer Assignment for Antenna regions" and "Use different layer assignments for antenna calculations only" Could you explain more in details?

    For my case, 3 different type of diffusion are used, DIFF, NDIFF and PDIFF. should I define the gate and drain area as below:-

    "Layer Assignment for Antenna regions"

    POLY1 = POLY1 and (DIFF or (NDIFF or PDIFF)) -- GATE

    DIFF = DIFF andnot POLY1 -- DRAIN

    PDIFF = PDIFF andnot POLY1 -- DRAIN

    NDIFF = NDIFF andnot POLY1 -- DRAIN

    "Use different layer assignments for antenna calculations only"

    POLY1 POLY1

    NDIFF NDIFF andnot POLY1

    PDIFF PDIFF andnot POLY1

    DIFF DIFF andnot POLY1

    CONT CONT

    "Layer connectivity"

    (METAL1 METAL2 VIA12)(METAL2 METAL3 VIA23)(METAL3 METAL4 VIA34)(METAL4 METAL5 VIA45)(METAL5 METAL6 VIA56)(DIFF METAL1 CONT)(NDIFF METAL1 CONT)(PDIFF METAL1 CONT)(POLY1 METAL1 CONT)

    By the way, I notice antenna info for version 5.4 and version 5.5 are different. Do you know the details?

    Regards, TS

Reply

  • Quek,

     I think we have moved a big step, some antenna info can be generated, But I am still confuse about the usage of "Layer Assignment for Antenna regions" and "Use different layer assignments for antenna calculations only" Could you explain more in details?

    For my case, 3 different type of diffusion are used, DIFF, NDIFF and PDIFF. should I define the gate and drain area as below:-

    "Layer Assignment for Antenna regions"

    POLY1 = POLY1 and (DIFF or (NDIFF or PDIFF)) -- GATE

    DIFF = DIFF andnot POLY1 -- DRAIN

    PDIFF = PDIFF andnot POLY1 -- DRAIN

    NDIFF = NDIFF andnot POLY1 -- DRAIN

    "Use different layer assignments for antenna calculations only"

    POLY1 POLY1

    NDIFF NDIFF andnot POLY1

    PDIFF PDIFF andnot POLY1

    DIFF DIFF andnot POLY1

    CONT CONT

    "Layer connectivity"

    (METAL1 METAL2 VIA12)(METAL2 METAL3 VIA23)(METAL3 METAL4 VIA34)(METAL4 METAL5 VIA45)(METAL5 METAL6 VIA56)(DIFF METAL1 CONT)(NDIFF METAL1 CONT)(PDIFF METAL1 CONT)(POLY1 METAL1 CONT)

    By the way, I notice antenna info for version 5.4 and version 5.5 are different. Do you know the details?

    Regards, TS

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