Home > Community > Blogs > PCB Design > what s good about allegro pcb hdi capabilities 16 5 has a few new enhancements
Login with a Cadence account.
Not a member yet?
Create a permanent login account to make interactions with Cadence more convenient.

Register | Membership benefits
Get email delivery of the PCB Design blog (individual posts).


* Required Fields

Recipients email * (separate multiple addresses with commas)

Your name *

Your email *

Message *

Contact Us

* Required Fields
First Name *

Last Name *

Email *

Company / Institution *

Comments: *

What's Good About Allegro PCB Router HDI Capabilities? 16.5 Has a Few New Enhancements!

Comments(2)Filed under: PCB Layout and routing, PCB design, High-Density Interconnect, HDI, Allegro, via, microvia, PCB Editor, PCB, layout, design, routing, SPB16.5, Allegro 16.5, via tangency, interconnects, inset vias, via rules, vias, via patterns

More high-density interconnect (HDI) improvements including the tuning of the auto-router (Allegro PCB Router - SPECCTRA) to use the via patterns, alignment of via list priority with Allegro PCB Editor, and creation and removal of anti-acid bars are available in the 16.5 release of the Allegro PCB Router.

Read on for more details…

In this release, the SPECCTRA auto-router provides the ability to use inset/tangency and stagger via patterns.

Autorouting with Via Patterns

The auto-router takes into consideration effective inset/tangency rules to find the most optimal 3D path. Usage of via patterns is regulated by via and via pattern costs.

Ordered Via Lists

In Allegro PCB Editor, the via lists were prioritized, but prior to the 16.5 release, the Allegro PCB Router did not have this capability. The 16.5 release now provides this ability.

This command will turn on/off the prioritization of the via list provided by Allegro.

set follow_usevia_priority on/off

Note: It is best to set this switch to on ONLY when working with HDI structures. When using standard PCB structures it is preferred to NOT set this switch.

Anti-acid bars

To avoid the acid traps at tangent/inset bbvias/microvias, Allegro PCB Router allows the creation of anti acid bars. These are rectangular bars created on each layer to avoid the acid traps.

The anti-acid bars are created by using the following command:

This command may be used to remove the anti-acid bars

The Allegro PCB Router constructs an anti-acid bar for each pair of tangent/inset bbvias as a path on a shared layer with the valid width values:

I welcome your feedback on these new 16.5 capabilities.

Jerry “GenPart” Grzenia


By hrienderhoff on May 9, 2012
Has Cadence implemented a translator from Allegro to Pads?

By Jerry GenPart on May 9, 2012
We do have a Pads to Allegro translator. But, no Allegro to Pads translator.
Jerry G.

Leave a Comment

E-mail (will not be published)
 I have read and agree to the Terms of use and Community Guidelines.
Community Guidelines
The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.