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Find a list of floating gates in schematic

pham777

Hi,

I wonder if there is a skill code to find hierarchily a list of transistors which have its gate

1) not connected to power/ground

2) and not connected to other devices(transistors, R,L,C)

I am using cadence IC615.

Thanks a lot,

HP

Parents

  • Hi Quek,

    Thanks for your input. Yes, DRC rule deck (not ERC) can catch these floating gates, but it only happen when you run DRC at the top level ( analog + digital ). At that time, it's probably too late .... The situation is this:

    we work on analog section of the chip and deliver to PnR people who will integrate with digital section. We see a lot of floating gates at our analog section but we don't know if they are real or not at this stage. What happen is there are a lot of gates which connected to output/input pins which inturn will be connected to digital section. Some of them are unused which cause real floating gates when they run drc at top level.

    I'd like to have a skill code to find a list of transistors in schematic (not in layout) which have its gates not connected to anything except pins, then I can determine which one is not used and terminate it properly by connecting to power/ground.

    Thanks a lot,

    HP

Reply

  • Hi Quek,

    Thanks for your input. Yes, DRC rule deck (not ERC) can catch these floating gates, but it only happen when you run DRC at the top level ( analog + digital ). At that time, it's probably too late .... The situation is this:

    we work on analog section of the chip and deliver to PnR people who will integrate with digital section. We see a lot of floating gates at our analog section but we don't know if they are real or not at this stage. What happen is there are a lot of gates which connected to output/input pins which inturn will be connected to digital section. Some of them are unused which cause real floating gates when they run drc at top level.

    I'd like to have a skill code to find a list of transistors in schematic (not in layout) which have its gates not connected to anything except pins, then I can determine which one is not used and terminate it properly by connecting to power/ground.

    Thanks a lot,

    HP

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