Markers and ports · 3 of 4

Several locations

A marker can hold several locations. List them in a block after at; they are numbered from 0 in the order written:

marker {
    output {
        at {
            out1.right_center
            out2.right_center
        }
        with {
            type = "waveguide"
            direction = "output"
        }
    }
}

with has a block form too, one attribute per line; its attributes apply to all the locations. From outside, the two locations above are s.marker.output[0] and s.marker.output[1].

A cell built from instances usually exports some of their ports as its own: its markers sit on ports of its instances. at accepts any point, including a port of an instance:

marker {
    input { at s.marker.input[0] with type = "waveguide", direction = "input" }
}

Exercise

In Fanout, attach a Waveguide to each output of the splitter s. Then export the ports: input at the input of the splitter, and one marker output with two locations, the far ends of the upper and the lower waveguide (in that order). Give them the attributes of the splitter's ports.

loading compiler…

import "tech.lyl"

cell Waveguide {
    param {
        length size = 10um
        width  size = 500nm
    }

    marker {
        input  { at core.left_center with type = "waveguide", direction = "input", width = width }
        output { at core.right_center with type = "waveguide", direction = "output", width = width }
    }

    layer si {
        shape rect with length, width as core
        place core.left_center at self.origin
    }
}

cell Splitter {
    marker {
        input {
            at inp.left_center
            with type = "waveguide", direction = "input", width = 500nm
        }
        output {
            at {
                out1.right_center
                out2.right_center
            }
            with {
                type = "waveguide"
                direction = "output"
                width = 500nm
            }
        }
    }

    layer si {
        shape rect with 10um, 500nm as inp
        shape rect with 20um, 4um as body
        clone inp as out1
        clone inp as out2
        place inp.left_center at self.origin
        place body.left_center at inp.right_center
        place out1.left_center at body.right_center offset (0, 1um)
        place out2.left_center at body.right_center offset (0, -1um)
    }
}

cell Fanout {
    place {
        Splitter at self.origin as s
    }
}

import "tech.lyl"

cell Waveguide {
    param {
        length size = 10um
        width  size = 500nm
    }

marker {
        input  { at core.left_center with type = "waveguide", direction = "input", width = width }
        output { at core.right_center with type = "waveguide", direction = "output", width = width }
    }

layer si {
        shape rect with length, width as core
        place core.left_center at self.origin
    }
}

cell Splitter {
    marker {
        input {
            at inp.left_center
            with type = "waveguide", direction = "input", width = 500nm
        }
        output {
            at {
                out1.right_center
                out2.right_center
            }
            with {
                type = "waveguide"
                direction = "output"
                width = 500nm
            }
        }
    }

layer si {
        shape rect with 10um, 500nm as inp
        shape rect with 20um, 4um as body
        clone inp as out1
        clone inp as out2
        place inp.left_center at self.origin
        place body.left_center at inp.right_center
        place out1.left_center at body.right_center offset (0, 1um)
        place out2.left_center at body.right_center offset (0, -1um)
    }
}

cell Fanout {
    place {
        Splitter at self.origin as s
    }
}

Edit the code, watch the layout, then press Submit to check your solution against the exercise.

Compiling…