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RTL compiler: how to do bottom-up synthesis

airland

I used Design Compiler before and do synthesis bottom-up. Now I changed to use RTL compiler to do synthesis. I have read the user manual but I did not found how to do bottom-up synthesis using RTL compiler. Could any one tell me or show me a simple synthesis script for bottom-up synthesis?

Thanks.

Parents

  • Hi airland,

    not sure what you are after. Synthesis tools do not know what you are gonig to do with the netlist so you can always use a synthesized netlist at the next level up. What are the specific of your bottom-up question ? For fast designs I would argue that Top-down traditionally yields better results. The benefits of top-down are various:

    - single scripts environment to maintain

    - no need to budget/guesstimate I/O delays

    - better optimization of constant driven paths

    This is not to say there are no benefits to running bottom up but the motivation you mention is better suited for top-down than bottom-up IMHO. In anycase, as per your original question, please clarify what aspects you are looking for and we can try to better help you

     regards,

    gh-

     

Reply

  • Hi airland,

    not sure what you are after. Synthesis tools do not know what you are gonig to do with the netlist so you can always use a synthesized netlist at the next level up. What are the specific of your bottom-up question ? For fast designs I would argue that Top-down traditionally yields better results. The benefits of top-down are various:

    - single scripts environment to maintain

    - no need to budget/guesstimate I/O delays

    - better optimization of constant driven paths

    This is not to say there are no benefits to running bottom up but the motivation you mention is better suited for top-down than bottom-up IMHO. In anycase, as per your original question, please clarify what aspects you are looking for and we can try to better help you

     regards,

    gh-

     

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