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Design007-Oct2019

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72 DESIGN007 MAGAZINE I OCTOBER 2019 Article by Brent Klingforth MENTOR, A SIEMENS BUSINESS Many PCB design projects miss schedule commitments by 70% due to delayed routing and lack of automation. Moreover, due to late- stage design changes, schedules are not met, and the addition of those new items takes 10 times longer or more to incorporate than if changes were added from the beginning. Fortunately, over the past several years, pow- erful routing capabilities have been added that allow designers to address a number of specif- ic, critical tasks. These automated, intelligent PCB placement and routing technologies can accelerate design cycle times by 50% or more, eliminating issues due to collision and space constraints. By taking advantage of these new routing solutions, designers are three times more likely to achieve first-pass design success and produce quality board designs on time. To outline what routing automation is, let's re- view the four pieces of the puzzle that, when used together, can cut 50% or more of your design cy- cle time (and even more dur- ing design updates) from the simplest to the most com- plex designs. 1. Design Rules Design rules are critical for designing a high-quality, robust PCB with automation, whether it's part placement, creating plane areas, or routing traces. With rules being an instrumental part of PCB design, electri- cal designers should have access to any rule that can be defined, from the PCB tool to the schematic tool. Limiting rule entry to only the PCB level or partial rules from the sche- matic delays the development process. This type of system forces the electrical engineer to use antiquated methods of conveying de- sign intent to the layout designer. A proper design flow would allow the electrical engi- neer to enter critical constraints, such as dif- ferential pairs; tuned routes; RF nets; high- power; sensitive, low-amplitude analog or digital signals; DDR channels; and more. If they choose to define common constraints, they have that ability as well. What kind of automation would we expect when it comes to creating design rules? Let's start with creating basic rules that every net that's not part of a special group would follow. The simplest way to see What Does Intelligent Routing Look Like?

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