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APS changes instance name

The Setlaz

Hi,

 

I'm facing kind of an issue here. I'm using Spectre-APS and noticed APS changes the instance name of iterated instances.

For example, let's say you have 4 instances in parallel, it's then called I1<3:0>. If I want to measure some OP param inside it, my OCEAN syntax would be:

pv("I1\\<2\\>.M1 "vth" ?result "dcOpInfo")

 

Problem is using APS, I1<2> gets renamed in I1<2>_turbo_m4   (note: m_N depend on the number of iterated instances...)hence, the OCEAN syntax to do the measurement has to change to:

pv("I1\\<2\\>_turbo_m4.M1 "vth" ?result "dcOpInfo")

 

Then, I can't swap APS option without changing my post-processing.

 Is there some option to disable this ?

 

I tried with ++aps enabled or disabled, it doesn't change anything.

 

Thanks,

Damien

Parents

  • Hi Damien,

    APS optimizes parallel devices to simulate them with m-factor because it is more efficient (and equally accurate). However, getting back operating point data is then not so simple - because you have to deal with the collapsed device (and split the result somehow).

    Anyway, this can be done with the Preserve Instance option on the Setup->High Performance Simulation form in ADE - set it to the specific instance in question, or set it to "All".

    In OCEAN this would be:

    option(?categ 'turboOpts 'preserveOption "All")

    Or if it is just selected instances, it would be:

    option( ?categ 'turboOpts
            'preserveInst  list("/I7/M3" "/I7/M1")
            'preserveOption  "Selected"
    )

    This corresponds to the preserve_inst=all or preserve_inst=[I7.M3 I7.M1] option in the spectre netlist (see "spectre -h options" for more details).

    Note that this will adversely affect the simulation performance (probably not much though, unless you have massive parallelization of devices).

    Regards,

    Andrew.

Reply

  • Hi Damien,

    APS optimizes parallel devices to simulate them with m-factor because it is more efficient (and equally accurate). However, getting back operating point data is then not so simple - because you have to deal with the collapsed device (and split the result somehow).

    Anyway, this can be done with the Preserve Instance option on the Setup->High Performance Simulation form in ADE - set it to the specific instance in question, or set it to "All".

    In OCEAN this would be:

    option(?categ 'turboOpts 'preserveOption "All")

    Or if it is just selected instances, it would be:

    option( ?categ 'turboOpts
            'preserveInst  list("/I7/M3" "/I7/M1")
            'preserveOption  "Selected"
    )

    This corresponds to the preserve_inst=all or preserve_inst=[I7.M3 I7.M1] option in the spectre netlist (see "spectre -h options" for more details).

    Note that this will adversely affect the simulation performance (probably not much though, unless you have massive parallelization of devices).

    Regards,

    Andrew.

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