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  3. Howto add more than one Tie High Cell

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Howto add more than one Tie High Cell

schnufff
schnufff over 13 years ago

 Hi,

in my design, the IO cells have configurable output strength, slew rate and so on. So I hardwired the configpins to something like b'0110. Because my std cell lib contains tie high/low cells I used the addTieHiLo command to add them. But encounter added only one cell in the center of my design. Therefore I have one very long wire to all IO cells, which results in Antenna violations during DRC.

The easiest solution would be to add one TieHigh cell for every side of the chip or even for every IO cell.

Is this possible? How to do it? I found nothing, except normal signal antenna violations(solved with jogging or diodes).

Thanks

Stefan

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  • wally1
    wally1 over 13 years ago

    Hi Stefan,

    You can use setTieHiLoMode to control the maximum distance or fanout for the tie cells added by addTieHiLo.

    Hope this helps.

    Regards,

    Brian

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  • schnufff
    schnufff over 13 years ago

    Thank you Brian,

    exactly what I was looking for.

     

    Cheers

    Stefan

     

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