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How to read synopsis directives in RTL compiler

Jai Mahankud
Hi, I have a verilog file in which synopsis directives are used "set_size_only find(cell, INST0)". While I compile & elaborate this file in RC, it does give error "could not interpret the SDC command. Please anyone suggest me how to read this directive in RC. Thanks, jai

  • Hi Jai,

    set_size_only is not an SDC constraint as per the latest SDC specification (1.8) hence RC (nor most tools out there) support this. RC does have an attribute 'preserve' that can accomplish the same task but it would require the user to rewrite does constraints. For the case you mentioned, it would read something like

     set_attribute preserve size_ok [find / -inst INST0]

    I suggest your SDC files only include SDC commands if you want to ensure all tools read them cleanly.

    regards,

    gh-

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