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How to simulate full custom digital circuit digitally in virtuoso(spectre)

wenxuzhao

 I've built a full custom digital circuit in virtuoso, suppose to run at 3GHz. I tried to simulate it for 1ms, which takes several days... Actually I just need digital behavior of it and do not care about the transistor level things. Is there any way that I can simulate it digitally, ie, reducing the simulation time? Thanks a lot!

Wenxu

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  • Andrew Beckett

    Hi Wenxu,

    You should not use "aps" as the choice of simulator under Simulator/Directory/Host - that is obsolete and was the initial interface to the APS technology. In fact in later IC615 ISRs it has been removed. The correct interface is the Setup->High Performance Simulation.

    In both modes the simulator is the same - but the interface via "aps" as  the simulator is more limited because it dates from when APS had just been implemented and only supported a subset of spectre's capability.

    Ultrasim has the benefit of being able to trade off accuracy versus speed for particular blocks, and if it's custom digital you probably don't need full spectre accuracy - and hence can get speed improvements that way.

    Regards,

    Andrew.

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  • Andrew Beckett

    Hi Wenxu,

    You should not use "aps" as the choice of simulator under Simulator/Directory/Host - that is obsolete and was the initial interface to the APS technology. In fact in later IC615 ISRs it has been removed. The correct interface is the Setup->High Performance Simulation.

    In both modes the simulator is the same - but the interface via "aps" as  the simulator is more limited because it dates from when APS had just been implemented and only supported a subset of spectre's capability.

    Ultrasim has the benefit of being able to trade off accuracy versus speed for particular blocks, and if it's custom digital you probably don't need full spectre accuracy - and hence can get speed improvements that way.

    Regards,

    Andrew.

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