What's Good About Allegro GRE Disabling Bundle Compression? It’s in the 16.5 Release!

With the SPB16.5 release of Allegro Global Route Environment (GRE), you can now prevent “Compact” routing on bundles that don’t need it.

This compact routing functionality was designed to keep the delay patterns as tightly packed as possible as part of a methodology that preserved design space. While this is a good thing, it does tend to increase coupling and crosstalk. Designs where this feature may be desired are very compact designs such as cell phones and notebooks where space is at a premium. Designs where this feature may be undesired include large systems boards, designs that have adjacent signal layer routing, network controllers and backplanes.

Read on for more details …

You have a couple ways to control this Allegro GRE behavior:
    - at the global level in Design Parameters, or
    - at the Bundle level on its own properties.

Select Setup> Design Parameters> Flow Planning> Routing Controls

Choose 'Disable compression during Plan Accurate' to Yes or No:

 

The other method:
RMB on the bundle and select 'Bundle Properties':

 

Here’s an example of Routing with Bundle compression:

 
                                                                                                     

Here’s an example of Routing without Bundle compression:

 
                                                                                                                     
Here’s a great VIDEO to watch demonstrating this capability.

As always, I look forward to your feedback using this new feature.

Jerry “GenPart” Grzenia