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How to edit Pin attributes (locations, terminal name etc.) on layout?

RuihW

Hello,

I have a layout that contains 900+ output pins. All the routings are finished and the only thing left is to connect them to the pins. These pins will be placed on the top of the boundary.

I can generate all the pins from schematic, but the pin placer would place then in a sequential order (P0, P1, P2 ...). My layout has a different pin order as shown below. So I'd like to use SKILL to place them since I know the coordinate of each pin.

But I'm stuck on getting and setting the attributes of the pins. I'm thinking to do something like this, but couldn't figure out what to put in for the fields in red.

foreach(inst geGetSelSet() ; select all from layout

    when(inst~>[type] == "[Pin]"  ; if the instance is a pin

        pin_name = inst~>[name] ;Parse pin's name, ie extract "0" from "P0"

        (calculate left_x_coord based on pin_name)

        inst~>[left_edge] = left_x_coord

        inst~>[right_edge] = left_x_coord+pin_width

    )

)

  • There you go

    inst~>[type] == "[Pin]" inst->pin if the instance is a pin
    inst~>[name] inst->pin->net->name Parse pin's name, ie extract "0" from "P0"
    inst~>[left_edge] leftEdge(inst)
    inst~>[right_edge] rightEdge(inst)

    You can extract pin number from pin name using the following expression

    rexMagic(t) && inst->pin->net->name && pcreMatchp("([0-9]+)$" inst->pin->net->name) && pcreSubstitute("\\1")

  • in reply to AurelBuche

    A minor addition to Aurélien's post - what people refer to as the "pin name" is usually the terminal name, which is often but not always the same as the net name. So rather than using inst->pin->net->name it's better to use inst->pin->term->name .

    Andrew

  • in reply to AurelBuche

    Thanks Aurelien and Andrew!

    A general question: where can I find such info? Is there a manual or reference? I had a similar issue when editing schematic instances but was lucky enough to guess the attribute name correctly.

  • in reply to RuihW

    Update: I found it from Cadence Function Reference.

  • in reply to AurelBuche

    Hi Aurel, theleftEdge() and rightEdge() can only return the x coordinate of the instance. How do I set the left and right edge of an instance? I tried inst~>xy = (x_coord:y_coord) but it didn't move the pin to that location.

  • in reply to RuihW

    The pins are almost certainly not instances (you variable naming is likely to be confusing). They are probably rectangles, and so you would need to update the bBox of the rectangle to do this. You can set rect~>bBox to the new bounding box, and the bounding box needs to be of the form list(lowerLeftX:lowerLeftY upperLeftX:upperRightY)

    Andrew

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