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Operating Conditions during predict_qos and synthesize -to_placed process.

admin

Hi there,

How can I change the operating conditions to ensure that RC extraction agrees with my synthesis settings?

Is the RTL Compiler physical synthesis enough, or the best practice is to run trial place and route on the Encounter?

At least in Encounter I have more control over the RC extraction process.

Thanks

Parents

  • Hi, thanks for reply.

     What happens with my design is that when executing the predict_qos method the tool recognizes my settings, however, when the encounter starts the spef wrote process, the system puts the follow message:

     rcOut Option :  -spef ../deliverables/logic/my_design.spef
    RC Out has the following PVT Info:
       RC-typical , Operating temperature 25 C
    Dumping Spef file.....
    ***** SPEF Out Finished (CPU Time: 0:00:00.1  MEM: 222.766M)

    and the Operating condition temperature is not the original one anymore

     I will try to run the same process with another library and conditions to check.

    Another issue that I observe is that the predict_qos does not maintain the DRV and exceeds the max transition and max capacitance limits, even when using the follow commands.

    set_attribute drc_first true
    set_attribute drc_max_trans_first true 

Reply

  • Hi, thanks for reply.

     What happens with my design is that when executing the predict_qos method the tool recognizes my settings, however, when the encounter starts the spef wrote process, the system puts the follow message:

     rcOut Option :  -spef ../deliverables/logic/my_design.spef
    RC Out has the following PVT Info:
       RC-typical , Operating temperature 25 C
    Dumping Spef file.....
    ***** SPEF Out Finished (CPU Time: 0:00:00.1  MEM: 222.766M)

    and the Operating condition temperature is not the original one anymore

     I will try to run the same process with another library and conditions to check.

    Another issue that I observe is that the predict_qos does not maintain the DRV and exceeds the max transition and max capacitance limits, even when using the follow commands.

    set_attribute drc_first true
    set_attribute drc_max_trans_first true 

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