Matched Length Routing Multiple Diff Pairs

eric_engineer — Tue, 13 Dec 2022 22:21:59 GMT

This is probably too advanced for this tool, but I need to route some busses made up of 5 diff pairs. Each pair must be matched to itself, but they must also be length matched to one another. Is there any way to constrain these nets and manual route them with DRC or a table that's updating automatically as I route?

In Allegro you just set the constraints and you can see length violations while you're routing or view them all in a table as you're working.

Re: Matched Length Routing Multiple Diff Pairs

jorge_garcia — Wed, 14 Dec 2022 22:01:48 GMT

Hi @eric_engineer,

I hope you're doing well. So the way to do this, is to route which ever the longest pair is going to be and figure out what it's length is. Then with the meander command active, enter that length into the command line and press enter. Now all of the diff pairs will be matched to that length as long as the meander command is active. If you ever cancel it you can just activate it again and enter the length in the CLI. At any point you change the length to meander to.

Let me know if there's anything else I can do for you.

Best Regards,

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Matched Length Routing Multiple Diff Pairs

Re: Matched Length Routing Multiple Diff Pairs