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Custom Grid Creation According to .tlef

Grant Brown

Hello,

I am inquiring about how to create a custom grid according to the .tlef metal routing tracks. The problem I seem to be running into is that Virtuoso only allows you to create a rectangular grid, however most routing tracks of the first two metal layers are offset so as to create a rectangle (removes parallel plate capacitors when routing is performed in non preferred direction). I have been reading the Virtuoso Layout XL documentation and the only thing I could find was the Display -> Grid Settings area in which you can set Minor and Major spacing, however regardless of how you do this it performs the spacing in both the x and y directions, therefore creating a square. However, I really am in need for a rectangular grid shape. Does anyone have any insight on this? A lot of other tools, such as Magic, allow this functionality, therefore I assume Cadence does too I am just missing something.

Thanks in advance!

Parents

  • There are routing grids (which can be defined in the technology file) - these can have different pitch and offset for horizontal and vertical, and different for each layer. You can also create track patterns (Create->P&R Objects->Track Patterns) which allow a more localised track setup (the routing grids are across the whole layout, whereas you can have different track patterns in different regions of the layout). You can control the visibility of these using the Grids section of the layer palette, and you can control whether wires snap to them in the Snapping section of the Options->Editor form. More information is (of course) in the documentation.

    Andrew.

Reply

  • There are routing grids (which can be defined in the technology file) - these can have different pitch and offset for horizontal and vertical, and different for each layer. You can also create track patterns (Create->P&R Objects->Track Patterns) which allow a more localised track setup (the routing grids are across the whole layout, whereas you can have different track patterns in different regions of the layout). You can control the visibility of these using the Grids section of the layer palette, and you can control whether wires snap to them in the Snapping section of the Options->Editor form. More information is (of course) in the documentation.

    Andrew.

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