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Variables in the SPEC section of Cadence Explorer

mhkvy4

Hello everyone,

I am using Virtuoso IC 6.1.8. 

In explorer in the outputs setup tab, can we include a pre-defined expr name in the SPEC column. For example I have my VIH_spec as the name of the expr and in the details the equation calculating VIH_spec as (0.7 * VAR("Vsupply")).

I cannot seem to include the value of VIH_spec calculated above as the spec for another expr.

Parents
  • ShawnLogan

    Dear mhkvy4,

    mhkvy4 said:

    . For example I have my VIH_spec as the name of the expr and in the details the equation calculating VIH_spec as (0.7 * VAR("Vsupply")).

    I cannot seem to include the value of VIH_spec calculated above as the spec for another exp

    How are you referring to your first expression? Are there any spaces in your expression name? I just tried your expression and set the spec for a second expression to be a function of the first specification and it appears to work as shown in Figure 1. I am using:

    $ virtuoso -W
    sub-version  ICADVM20.1-64b.500.22

    $

    Shawn

    Figure 1

  • mhkvy4
    in reply to ShawnLogan

    Hi sorry to bump this old thread.

    Shawn, if I have the spec including VAR like you do for output_noise_1 then it works. If I have the expr name in my spec column (like you do for output_noise_2, referring to output_noise_1) then I don't get the right result. It shows that I failed the spec even though I passed it

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  • mhkvy4
    in reply to ShawnLogan

    Hi sorry to bump this old thread.

    Shawn, if I have the spec including VAR like you do for output_noise_1 then it works. If I have the expr name in my spec column (like you do for output_noise_2, referring to output_noise_1) then I don't get the right result. It shows that I failed the spec even though I passed it

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  • Andrew Beckett
    in reply to mhkvy4

    It also doesn't work robustly for me either. If you use "re-evaluate" it fails with an error, and during simulation I too get a failed spec even though it should have passed.

    Instead of having just referred to output_noise_1 directly, use calcVal("output_noise_1") in the spec; that seems to work correctly (I can see both passes and fails with the correct limits if I do that).

    Andrew

  • mhkvy4
    in reply to Andrew Beckett

    Hi Andrew.

    I just tried it out and calcVal does indeed work. Thanks for your help. 

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