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how to use "delete cell" or any block syntax to let Assura ignore bit cell?

lijulia

We used faraday memory compiler to generate memory cell .gds file and stream in to the Cadence, but got Assura LVS errors when we did chip  top level lvs check,and most issues related to the dummy cells in the memory block, eg. SHLD_DMY_CORNER_SE cell;

 And we got this reply from the faraday "Since the bit cell using special design rule.  It is not a standard logic device. your error is caused by Assura LVS command file. As you know , our memory was pass CALIBRE DRC/LVS ,and has good yield in silicon. Our suggestion is not to check the bit cell by using Assura DRC/LVS.The memory bit cell was provided by foundry , UMC and Faraday will insure the bit cell was correct. Please ignore all bit cell error when you running DRC/LVS (maybe use "delete cell" or any block syntax to let Assura ignore bit cell) "

 

But I already tried ignore cells, blackbox etc.; but nothing work; after I flatten the whole top, it didn't complain the pin mismatch of the dummy cells but got other errors...

 

Please give me some suggestion about this, thanks

 

 


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  • Hi Julia

    I will interprete "It is not a standard logic device" to mean that your current Assura extract rules file does not has the cmds to extract the special devices in the memory block. This would be a limitation of the foundry rules file and not Assura itself. If you use ?ignoreCell from avParameters to prevent extraction of this cell, will it work? You can apply avCompareRules "ignoreCell" to also ignore the same cell on schematic side.

    If the above does not work, please check the log file for any warnings/errors on why the cmds did not work. Thanks.

    Best regards
    Quek

Reply

  • Hi Julia

    I will interprete "It is not a standard logic device" to mean that your current Assura extract rules file does not has the cmds to extract the special devices in the memory block. This would be a limitation of the foundry rules file and not Assura itself. If you use ?ignoreCell from avParameters to prevent extraction of this cell, will it work? You can apply avCompareRules "ignoreCell" to also ignore the same cell on schematic side.

    If the above does not work, please check the log file for any warnings/errors on why the cmds did not work. Thanks.

    Best regards
    Quek

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