Fluid GR automation

Hi Neeraj,

You just need to instantiate the fluid guard ring as an instance, probably setting the shapeData and shapeType parameters. The shapeData parameter is a string parameter (usually) which may be encoded differently depending on the implementation and whether it's a path or a polygon - best thing to do would be to create some instances and look at the values of these two parameters (note, the parameters do not have to be called shapeData and shapeType, but the standard template-based FGRs that Cadence supply use these parameters).

You can then create them using dbCreateParamInst or dbCreateParamInstByMasterName and pass the relevant parameters that way. Or create them and then update the ~>shapeData and ~>shapeType parameters as needed - better to create them right up front though probably.

Regards,

Andrew.

Hi Andrew,

Thanks for the tip's. I will add it as an instance do the processing of points as you mentioned.

Thanks Again

Neeraj 

Hi Andrew,

I tried to create the GR as an instance. I am stuck with the ~>shapeData. I have list of points and i am unable to convert them to string. Do we have any specific function which can do this?

Regards

Neeraj 

Got it thanks :). Was using %B for list instead of %L in spritf. 

Regards

Neeraj 

Hi Andrew,

I am able to successfully create the Fluid Guard Ring but i am facing one problem. To create FGR i am taking the points and modifying the points to fall in pitch of the OD and POLY. 

For Polygon: It works like i want to. The center points of the FGR fall on the points i give.

For Rectangle: It creates the FGR but it doesnt do on the center points rather than on the inside points.

Right now i am editing the points by subtracting the OD/2 and PO/2 to make them fall on line. but is it correct? 

So are you setting the shapeType to "rect"? If so, the shapeData (for a standard fluid guard ring as produced by the normal template based approach we provide) is really a rectangular filled region where you've specified a string representation of the bBox. That bBox represents the diffusion area.

Note in all cases that the coordinates in shapeData are relative to the origin of the pcell instance (so relative to the ~>xy of the instance). 

Normally if I create a rectangular fluid guard ring, it's actually a "path" fluid guard ring where the points correspond to the centre line (again, relative to the ~>xy of the instance).

Regards,

Andrew.

Hi Andrew,

First i tried passing shapeType as "rect" and shapeData as "bBox" but this doesn't create the FGR and doesn't through any error message. So i tried shapeType as "polygon" and derived shapeData from bBox as "points", this creates the FGR but not on the points. Below is the code i have as of now, it works good for polygon shapes but not for the rectangle ones.

procedure(nvGRCreation(cvID gr_type polyPitch odPitch shpID pSub)
if(car(shpID~>objType) == "rect" then
foreach(shpPt car(shpID~>bBox)
modX=polyPitch * round(quotient(lowerLeft(shpPt) polyPitch))
modY=odPitch * round(quotient(upperRight(shpPt) odPitch))
newShpPts=append1(newShpPts list(modX modY))
);foreach
x1=lowerLeft(lowerLeft(newShpPts))
x2=lowerLeft(upperRight(newShpPts))
x3=lowerLeft(upperRight(newShpPts))
x4=lowerLeft(lowerLeft(newShpPts))
y1=upperRight(lowerLeft(newShpPts))
y2=upperRight(upperRight(newShpPts))
y3=upperRight(lowerLeft(newShpPts))
y4=upperRight(upperRight(newShpPts))
pathShpPts=list(list(x1 y1) list(x3 y3) list(x2 y2) list(x4 y4))
else
foreach(shpPt car(shpID~>points)
modX=polyPitch * round(quotient(lowerLeft(shpPt) polyPitch))
modY=odPitch * round(quotient(upperRight(shpPt) odPitch))
newShpPts=append1(newShpPts list(modX modY))
pathShpPts=newShpPts
);foreach
);if

dbCreateParamInst(cvID gr_type nil list(0 0) "R0" 1
list(list("width" "string" "0.144")
list("ignore" "boolean" "TRUE")
list("shapeData" "string" sprintf(nil "%L" newShpPts))
list("shapeType" "string" car(shpID~>objType))
list("odFin" "string" "8")
list("odFinger" "string" "3")
list("formalVersion" "int" 8)
list("innerDP" "string" "OFF"))
t
)

);procedure

I suspect you probably should contact customer support for this as we probably need to see your fluid guard rings to be able to work out what the issue is. 

Your code uses some uninitialised variables, such as newShpPts, so it's not that clear to me what is going on.

Regards,

Andrew.