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 different types of cells in timing fix 

Last post Mon, Jan 16 2012 7:43 AM by Kari. 1 replies.
Started by DSubbu 14 Jan 2012 05:56 PM. Topic has 1 replies and 1113 views
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  • Sat, Jan 14 2012 5:56 PM

    • DSubbu
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    • Joined on Sat, Apr 23 2011
    • visakhapatnam, Andhra Pradesh
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    different types of cells in timing fix Reply

    hi all,

    can any one please let me know the difference between normal buffers ,clock buffers and delay buffers wrt all aspects ?

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  • Mon, Jan 16 2012 7:43 AM

    • Kari
    • Top 10 Contributor
    • Joined on Tue, Jul 15 2008
    • Cary, NC
    • Posts 718
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    Re: different types of cells in timing fix Reply

     It can depend on the library, but clock buffers are usually meant for building the clock tree and have balanced rise/fall times so that there is no duty cycle distortion on the tree. Also, some libraries have clock buffers that have built-in decap. Delay cells usually just have a much larger delay than regular buffers, and can be a larger area as well. All kinds can be used during optimization to meet timing. Some designers prefer to limit clock buffers to the clock tree, just because then you know if you're looking at a clock buffer, you know it's a clock net. Delay cells are typically only used in hold fixing, but that can vary too.

    • Post Points: 5
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Started by DSubbu at 14 Jan 2012 05:56 PM. Topic has 1 replies.