mirror of https://github.com/VLSIDA/OpenRAM.git
76 lines
2.8 KiB
Python
76 lines
2.8 KiB
Python
#!/usr/bin/env python
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import gdsMill
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#we are going to make an array of instances of an existing layout
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#assume that we designed the "base cell" in cadence
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#step 1 is to stream it out of cadence into a GDS to work with
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# creater a streamer object to interact with the cadence libraries
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streamer = gdsMill.GdsStreamer()
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# use the streamer to take a cadence layout, and convert it to GDS 2 for us to work with
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# the GDS will be named testLayoutA.gds
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#streamer.streamFromCadence(cadenceLibraryContainerPath = "~/design/600nmAmi",
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# libraryName = "gdsMillTest",
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# cellName = "testLayoutA",
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# outputPath = "./gdsFiles")
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#next, load our base cell layout from the GDS generated above
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arrayCellLayout = gdsMill.VlsiLayout()
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reader = gdsMill.Gds2reader(arrayCellLayout)
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reader.loadFromFile("./gdsFiles/testLayoutA.gds")
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##since we will be streaming into the same library that testLayout came from
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#let's rename it here so that we don't overwrite accidentally later
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arrayCellLayout.rename("arrayCell")
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#now create a new layout
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#be sure to assign a name, since this will be the root object in our hierarchy to which
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#all other objects are referenced
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newLayout = gdsMill.VlsiLayout(name="arrayExample")
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#now place an instnace of our top level layout into the filled layout
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#hierarchy looks like this:
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# array example
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# array cell layout
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# layout elements
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# layout elements
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# layout elements
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# cell instance
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# cell instance
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# cell instance
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# connection elements .....
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#now create the array of instances
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for xIndex in range(0,10):
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for yIndex in range(0,10):
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if(yIndex%2 == 0):
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mirror = "MX"
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else:
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mirror = "R0"
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newLayout.addInstance(arrayCellLayout,
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offsetInMicrons = (xIndex*10.0,yIndex*15.0),
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mirror = mirror,
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rotate = 0.0)
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#add a "wire" that in a real example might be a power rail, data bus, etc.
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newLayout.addPath(layerNumber = newLayout.layerNumbersInUse[7],
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coordinates = [(-20.0,0.0),(25.0,0),(25.0,10.0)],
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width = 1.0)
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#add some text that in a real example might be an I/O pin
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newLayout.addText(text = "Hello",
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layerNumber = newLayout.layerNumbersInUse[5],
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offsetInMicrons = (0,0),
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magnification = 1,
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rotate = None)
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newLayout.prepareForWrite()
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#and now dump the filled layout to a new GDS file
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writer = gdsMill.Gds2writer(newLayout)
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writer.writeToFile("./gdsFiles/arrayLayout.gds")
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#and stream it into cadence
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#streamer.streamToCadence(cadenceLibraryContainerPath = "~/design/600nmAmi",
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# libraryName = "gdsMillTest",
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# inputPath = "./gdsFiles/arrayLayout.gds")
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