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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

  • First of all, there is no tool called "Cadence". That's the name of the company, not the tool. To briefly answer your questions:

    1. No idea. It depends on what has been put in the views "schematic" and "schematic_sim". View names can be called whatever you want, and so the contents of these views is entirely dependent upon whoever created them. We have no convention for views called "schematic_sim" - you'd have to ask whoever created them. I suspect that one is the physical representation of the view, and the other has a different model for simulation - but that's just a wild guess based on the names - as I said, you would have to ask whoever provided the two views.
    2. spectreS has been obsolete since IC443 (released in about 1999/2000) and has not existed in the tools since IC610 (2006). So it's hardly surprising that spectreS views don't exist. The "spectreS" view and simulator was an old "socket" simulator which used cdsSpice as a pre-processor before running the simulation in spectre; the "spectre" view/simulator in ADE was introduced in IC443 as a direct interface between Virtuoso and the simulator without using cdsSpice as a pre-processor. Given that it's been around for at least 17 years, there really is no good reason to try to use an ancient interface that isn't even available in any release of the software from the last 10 years!
    3. Yes. We even have a capability in ADE XL called "MTS" (Multi-technology support) which allows you to simulate devices from two different technologies together (it scopes the models so that they only apply to parts of the design hierarchy, which solves the problem if the model names are the same for two different technologies). That may not be what you want, but simply plotting results from two different simulations is even easier and I assume you could have just tried that yourself.

    Regards,

    Andrew

Reply

  • First of all, there is no tool called "Cadence". That's the name of the company, not the tool. To briefly answer your questions:

    1. No idea. It depends on what has been put in the views "schematic" and "schematic_sim". View names can be called whatever you want, and so the contents of these views is entirely dependent upon whoever created them. We have no convention for views called "schematic_sim" - you'd have to ask whoever created them. I suspect that one is the physical representation of the view, and the other has a different model for simulation - but that's just a wild guess based on the names - as I said, you would have to ask whoever provided the two views.
    2. spectreS has been obsolete since IC443 (released in about 1999/2000) and has not existed in the tools since IC610 (2006). So it's hardly surprising that spectreS views don't exist. The "spectreS" view and simulator was an old "socket" simulator which used cdsSpice as a pre-processor before running the simulation in spectre; the "spectre" view/simulator in ADE was introduced in IC443 as a direct interface between Virtuoso and the simulator without using cdsSpice as a pre-processor. Given that it's been around for at least 17 years, there really is no good reason to try to use an ancient interface that isn't even available in any release of the software from the last 10 years!
    3. Yes. We even have a capability in ADE XL called "MTS" (Multi-technology support) which allows you to simulate devices from two different technologies together (it scopes the models so that they only apply to parts of the design hierarchy, which solves the problem if the model names are the same for two different technologies). That may not be what you want, but simply plotting results from two different simulations is even easier and I assume you could have just tried that yourself.

    Regards,

    Andrew

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