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Auto-Interactive delay tune, not working in Allegro 16.6 007

Kabal

 Hello, I am attaching a picture snapshot of constraints I created for two pinpairs. One pinpair is longer than another, I want Auto-interactive delay tune to make shorter pinpair (DIN2)  has the same length as a longer pinpair (DIN1).

 After matched group constraint is created, analyzed and reports the mismatch in length in %, I go back to PCB Editor, select Route->Auto-Interactive Delay Tune, then click on the shortest pinpair, but nothing happens, it does not get increased in length.

 And in the console I read:

Clines Selected: 1; Timing constraints: 1; Timing violations: 1; Outside ideal range: 1

 What am I doing wrong?

 

I tried with the latest release, same thing! It just does not work! 

 I also tried on another pair of signals, located near each other and with tons of space around, still does not work!!

 I even tried to increase tolerance, it simply does nothing!

Does this feature even work normally in this software, or it only works in online demonstration clips?

Or what conditions have to be met to make it work?

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  • brettcad

    Hi Kabal,

    There are some routing situations that will limit AiDT from adding tuning bumps onto selected clines.  (attached list)
    You may also want to check File->Viewlog after the AiDT command has been run.  It can sometimes indicate problems encountered during the command run.

    Limitations 1.      Diff Pair Phase:  AiDT will not change the phase imbalance for a diff pair.  It is recommended to get diff pairs into phase before running AiDT.2.      Odd-angle routing:  AiDT will not add tuning patterns onto odd-angle cline segments.  AiDT will also not push/shove any odd-angle cline segments during processing.3.      Arcs:  AiDT will not add tuning patterns onto arc cline segments.  AiDT will also not push/shove any arc cline segments during processing.4.      Wide routing:  AiDT will not add tuning patterns onto cline segments that are routed wider than Min Line Width.  AiDT will also not push/shove any cline segments during processing that are routed wider than Min Line Width.5.      Shortening:  AiDT will not attempt to shorten signals to meet timing constraints.  For Relative Propagation Delay constraints, all signals in the matchgroup will be increased to be within range of the longest signal.6.      Dangling Clines: AiDT will not add tuning patterns to dangling clines.  The cline selected must be part of a connected rat (pin-pair) on the net.

         

    Regards,

    Brett

Reply
  • brettcad

    Hi Kabal,

    There are some routing situations that will limit AiDT from adding tuning bumps onto selected clines.  (attached list)
    You may also want to check File->Viewlog after the AiDT command has been run.  It can sometimes indicate problems encountered during the command run.

    Limitations 1.      Diff Pair Phase:  AiDT will not change the phase imbalance for a diff pair.  It is recommended to get diff pairs into phase before running AiDT.2.      Odd-angle routing:  AiDT will not add tuning patterns onto odd-angle cline segments.  AiDT will also not push/shove any odd-angle cline segments during processing.3.      Arcs:  AiDT will not add tuning patterns onto arc cline segments.  AiDT will also not push/shove any arc cline segments during processing.4.      Wide routing:  AiDT will not add tuning patterns onto cline segments that are routed wider than Min Line Width.  AiDT will also not push/shove any cline segments during processing that are routed wider than Min Line Width.5.      Shortening:  AiDT will not attempt to shorten signals to meet timing constraints.  For Relative Propagation Delay constraints, all signals in the matchgroup will be increased to be within range of the longest signal.6.      Dangling Clines: AiDT will not add tuning patterns to dangling clines.  The cline selected must be part of a connected rat (pin-pair) on the net.

         

    Regards,

    Brett

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