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Cell views & plot in cadence

Charanraj Mohan

Hi,

1. What are the difference between schematic and schematic_sim in cadence ?

For example, I have schematic_A which has a symbol_B. Symbol_B further has some schematic with a symbol_C of a verilog-A code and schematic_A is again made as a symbol_A.

The hierarchy is something like this: Symbol_A-->Symbol_B-->Symbol_C

When I desend symbol_A in my main schematic to look what is inside, Cadence gives me option to open in the following:-

a. Schematic

b. Schematic_sim

c. Layout_int

d. Extracted

e. Schematic_lvs &

f.  Symbol

When I desend & open the schematic_A by schematic the Symbol_B doesnot appear. But when I open it with schematic_sim the Symbol_B appears. I want to know the reason of it or an explanation of where to use Schematic and Schematic_sim.

2. Similarly, where to use spectre, spectreS and symbol of the models in the FDK and their compatibility.  For the fact I noticed that, as we go down the technology spectreS is missing. For example in UMC 130 nm and 28nm technologies the spectreS view of the module is unavailable, whereas in AMS 0.35um we have it. Is it something like spectreS is an old cell view format ?

3. Is it possible in Cadence to plot two different plots from different technology ?

Thanks in advance.

Parents

  • Using MTS would require you to have all four technologies running in the same session. That might be challenging, although if they're different foundries it may not be too bad as they wouldn't be so likely to clash. Even if you did this, I'd recommend creating the schematics for each in an environment that only had one PDK available to avoid the risk of clashes, and then create a schematic with the four inverters present.

    The MTS documentation that I pointed you would tell you how to point at the model files for each of the different instances - and you'd have to simulate in ADE XL.

    However, since you're really doing this for comparison reasons rather than really needing to simulate them together, wouldn't it be simpler to run your four simulations and then use the ViVA results browser to open the results from each of the four simulation results directories, and then plot them together on the same graph? That's easy enough to do... certainly doesn't need a tutorial to do it (nor does MTS, to be honest).

    Regards,

    Andrew.

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  • Using MTS would require you to have all four technologies running in the same session. That might be challenging, although if they're different foundries it may not be too bad as they wouldn't be so likely to clash. Even if you did this, I'd recommend creating the schematics for each in an environment that only had one PDK available to avoid the risk of clashes, and then create a schematic with the four inverters present.

    The MTS documentation that I pointed you would tell you how to point at the model files for each of the different instances - and you'd have to simulate in ADE XL.

    However, since you're really doing this for comparison reasons rather than really needing to simulate them together, wouldn't it be simpler to run your four simulations and then use the ViVA results browser to open the results from each of the four simulation results directories, and then plot them together on the same graph? That's easy enough to do... certainly doesn't need a tutorial to do it (nor does MTS, to be honest).

    Regards,

    Andrew.

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