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Spectre/Ocean multiple analysis naming

Felipe Frantz

Hi,

 I have a question on how multiple circuit analysis are named in Spectre and how to retrieve them in Ocean (I'm using ic5141). Basically my input netlist has the following analysis statements:

// DC operating point.
    openLoopDC dc oppoint=rawfile annotate=no save=selected

// AC open loop.
    openLoopAC ac start=1e3 stop=300e6 dec=10 prevoppoint=yes

// Unity gain: ( ICMR, Slew rate )
    please1 alter dev=Ri param=r value=1.0T
    please2 alter dev=Rf param=r value=0.1
    icmrDC dc save=selected param=tb_VDCPlus center=0 span=VSupply maxiters=150 maxsteps=10000 lin=20
    slewTran   tran stop=2*(VSupply*tb_tranRatio)*1e-6 errpreset=conservative maxiters=5

// x10 gain: ( Output swing )
    please3 alter dev=Ri param=r value=tb_Ri
    please4 alter dev=Rf param=r value=(tb_clGain*tb_Ri)
    outSwingDC dc save=selected param=tb_VDCMinus center=0 span=VSupply/2 lin=20

I run spectre and get a ./netlist.raw folder with the following content:

 icmrDC.dc  openLoopAC.ac  openLoopDC.info  slewTran.tran
 logFile    openLoopDC.dc  outSwingDC.dc

 

Then I open ocean and tell it to load the results : openResults( "netlist.raw" ) . I the ask for the available results typing results() and get:

 (dcOp ac tran dc "icmrDC-dc"
    "openLoopDC-info"
)

Which is very different from what I asked for =/

Can someone explain me how ocean reads the results? I'm writing skill scripts to automate my design and I must know exactly the names of the analysis results, so that I can automate the post-processing easily.

 Thanks

 

Parents
  • Andrew Beckett

    What you're seeing is the "aliased" names for the results (in some cases). For convenience (and also to help with complex analyses like monte carlo), there is a concept of the aliased name for a result database so that you don't need to know that an ac analysis inside a monte carlo has a different name in practice.

    You can reference the names using either the aliased name or the full name. So for example, when I ran your example, I get:

    ocean> results()
    ("outSwingDC-dc" ac tran dc "icmrDC-dc"
        "openLoopDC-info"
    )
    ocean> results(?noAlias t)
    ("outSwingDC-dc" "openLoopAC-ac" "slewTran-tran" "openLoopDC-dc" "icmrDC-dc"
        "openLoopDC-info"
    )

    The names (as you can see) are the instance name of the analyses, followed by "-" and the type of the analysis. There's a one to one correspondence between these two lists. So that means I can either do:

      selectResult("ac")

    or

      selectResult("openLoopAC-ac")

    Both will work equally well.

    Hope that helps. The ?noAlias t is probably what you want here...

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    What you're seeing is the "aliased" names for the results (in some cases). For convenience (and also to help with complex analyses like monte carlo), there is a concept of the aliased name for a result database so that you don't need to know that an ac analysis inside a monte carlo has a different name in practice.

    You can reference the names using either the aliased name or the full name. So for example, when I ran your example, I get:

    ocean> results()
    ("outSwingDC-dc" ac tran dc "icmrDC-dc"
        "openLoopDC-info"
    )
    ocean> results(?noAlias t)
    ("outSwingDC-dc" "openLoopAC-ac" "slewTran-tran" "openLoopDC-dc" "icmrDC-dc"
        "openLoopDC-info"
    )

    The names (as you can see) are the instance name of the analyses, followed by "-" and the type of the analysis. There's a one to one correspondence between these two lists. So that means I can either do:

      selectResult("ac")

    or

      selectResult("openLoopAC-ac")

    Both will work equally well.

    Hope that helps. The ?noAlias t is probably what you want here...

    Regards,

    Andrew.

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