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Fluid Guardring Questions

dpilhorn

 After many, many months I am finally on a project using IC6.1.5!  My first business was to try to figure out the answer to my question from a long time ago (Link is to post in this community)

 www.cadence.com/.../1267301.aspx

 

Now I have a new set of issues.... sigh.  I do not have any write permissions to the techfile and the techfile does not have any Guard Rings defined!  So, I'm back to square one with the exception that I can't seem to find enough answers in the documentation.   I'm sure there is there a way to set up my own Guard Ring outside of the tech file since I was able to find the fluidGuardRingInstallPath environment variable but I can not find any documentation on how to set everythign up in skill or with GUI?

 

Can anyone give me a direction to start, I have a very short amount of time before I have to start moving polygons around and won't be able to spend more time "playing" with the new tool.

Thanks in advance,

Dan

Parents

  • Hi Dan,

    1. Fluid guardrings are implemented as a cell instance, the master is a PCell.  So your alternative here is a ROD multi-part path guardring which could be choppable, or some custom approach for specific situations. In IC615 for Create Via there is the ability to define the cut pattern,and this can be all sorts of shapes, e.g. diagonal, checkerboard, stripes and so on.  There are times when an FGR might be advantageous, and there may be times where an MPP is the better choice - YMMV.

    2. Data should not be created off grid - I suggest a Service Request to Cadence Customer Support to investigate if there is a bug.

    3. I only looked at one example of a diagonal path; in my case the diagonal contacts were cuts with vertical and horizontal edges (i.e. not following parallel to the diagonal edges) and the horizontal and vertical edges were spaced apart by the min distance (say 0.22, so the corner to corner spacing was 0.311) . What do you have the Contact Spacing Method set to, distribute or minimum? The latter choice should use the minimum spacing rule, but the former will be minimum or larger, as needed to "share" any excess space between the cuts.

    You may be able to tell that I don't have a lot of experience playing with FGRs, so some of this might come down to reading the docs, and some of it might be due to a bug.

    Regards,

    Lawrence.

Reply

  • Hi Dan,

    1. Fluid guardrings are implemented as a cell instance, the master is a PCell.  So your alternative here is a ROD multi-part path guardring which could be choppable, or some custom approach for specific situations. In IC615 for Create Via there is the ability to define the cut pattern,and this can be all sorts of shapes, e.g. diagonal, checkerboard, stripes and so on.  There are times when an FGR might be advantageous, and there may be times where an MPP is the better choice - YMMV.

    2. Data should not be created off grid - I suggest a Service Request to Cadence Customer Support to investigate if there is a bug.

    3. I only looked at one example of a diagonal path; in my case the diagonal contacts were cuts with vertical and horizontal edges (i.e. not following parallel to the diagonal edges) and the horizontal and vertical edges were spaced apart by the min distance (say 0.22, so the corner to corner spacing was 0.311) . What do you have the Contact Spacing Method set to, distribute or minimum? The latter choice should use the minimum spacing rule, but the former will be minimum or larger, as needed to "share" any excess space between the cuts.

    You may be able to tell that I don't have a lot of experience playing with FGRs, so some of this might come down to reading the docs, and some of it might be due to a bug.

    Regards,

    Lawrence.

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