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Is it true autorouter cannot handle 45 degree angles?

nmz787

First of all, I am very very new to Cadence. I've done some board design and layout in KiCad before for a mixed-signal project.

My colleagues are telling me the default autorouter in Cadence can't handle 45 degrees off of a pin, which basically means we can't use the autorouter for a BGA device that can only be broken-out/fanned-out with two 45 degree angles.

I was told the GRE (from googling I think this is the Global Routing Environment) can do 45s, but needs a lot more hand-holding/manual-interaction.

I have more questions, but I don't want to make this post too long and complex.

Is the info I'm hearing in work meetings correct (they say the 45s only get implemented by post-processing 90s with a 'miter' operation)?

  • Robert Finley

    Except for DDR data and address lines, I'm just not seeing designs that lend themselves to "just connect the dots". 

     Cadence Specctra only routes orthogonally (90 degree) but is able to convert to a 45 degree route as a cleanup pass...provided you don't have a via transition.

    With TimingVision and AiDT, I'm quite happy. 

  • nmz787

    I wouldn't be autorouting the entire board... i.e. point-to-point.... but the problem is that even for a specific pin/net... if I want to autoroute it from the BGA pin, the autorouter fails before it even gets a few mils from the BGA pin since it crashes into another BGA pin (due to lack of 45 degree ability.). This also means that post-processing a 90 into a 45 can never happen, unless you can force the autorouter to overlap the other pins until post-processing can occur (which seems to be a fundamental constraint the autorouter always works within).

     

    Basically I'm looking to automate some of our design process... telling the software something like 'auto-route this pin from the BGA to some connector' or 'autoroute this net'.

     

    Is there a layout scripting tutorial? Is that a 'do' file, or SKILL code?

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