Breakout board for the latest documentation including this guide and other downloads. In this example, vias are used for the rx channel breakout at the bga, and for both the tx and rx channels at the cfp2 connector. Figure 21 cam artwork screen shots 381 ball cabga layer 1 primary layer 2 gnd from mechanical 101 at nit rourkela. Almost as quick as the bga wizard and allows you to customize your breakout. An efficient breakout solution will provide a foundation for layer reduction. Altium designer blind and buried via bga escape routing. Mentor graphics just published a book by charles pfeil covering more than you will ever care to know about bga routing. This book presents a number of studies and solutions for addressing these challenges.
Bga geometries generally require pads of a certain size, allowing us to route a single trace in between. This is a newer package from intel and gives us a view into the future bga routing isnt going to get easier anytime soon. Pcb layout recommendations for bga packages 185 64ball csbga bga breakout and routing example this example places an ispmach 4000ze cpld in a 5 mm x 5 mm, 0. Pcb layout recommendations for bga packages lattice. Effective design methods for very large bgas pfeil, charles on.
Without a breakout strategy for getting traces out of the bga, the layer count will be. For the first two rows from the outside in of the bga array, the balls have been arranged to allow wider traces than would otherwise be possible. It covers critical length, reference planes, timing, skew, crosstalk, coupling, vias, and routing. Dogbone routing is preferred as it is lower cost and less risk of soldering issues. With a bga, you can also use any angle routing as you break out from the pads beneath your component. This restricts us to a maximum of two rows on the top layer and two more there are. Breakout season 2 episode 9 southsider gang escape. Bga fanout the superior algorithm escapes all of your bga nets, so you receivedt waste time fanning out manually. Next, select an entire bga quadrant of traces and vias right click and rotate 90 degrees and paste a new quadrant of breakouts. Fortunately, your pcb design tools can do a lot to help you with your routing of bga packages. The routing strategy includes stacked and staggered vias. Manufacturing a rigid flex printed circuit board method. I have found that the fanout vias placed by the situs autorouter are all fullstack vias although both blind and buried vias are defined too via layerpairs in the layer stack manager. Were bummed we missed you at adobe summit, but were incredibly excited to invite you to our adobe summit virtual breakout session.
Im attempting to use the autorouter in altium designer to simplify with the fanout and escape routing of my 780pin fpga 8layer pcb. Adobe connect 8 creating and managing breakout rooms. In breakout room, participants need permissions to use the pods to do their work and engage with each other using the pods. This image from altium shows a 4layer fanout for a small bga. Auto interactive breakout technology allegro design planning option duration.
French norm nf c 937 january 1989 how to express general characteristics and particular characteristics. You can see that you start to have difficulty routing out the further in you go. Inmate gets trapped in tunnel after trying to breakout from brazilian pris. These definitions are in the context of bga breakouts and routing. Specifically, the channel breakout underneath the ball grid array bga has an impact on the board signal integrity and cost. Prior to routing, power pins can be intelligently connected to full or partial planes, and the fanout router used to create intelligent breakout patterns for high pincount smt devices, using geometric or spiral via patterns to simplify routing on inner layers. Tn1074 pcb layout recommendations for bga packages. Ac462 application note polarfire fpga package fanout. Careful planning goes into routing out of a bga package like this. Ive never heard of a free app that could do that yet. Every image a customer downloads from cisco site is cryptographically signed using cisco. For support resources such as answers, documentation, downloads, and. To avoid the top layer keep out requirement of the cfp2 metal connector cover assembly, the tx channel routing is switched briefly to the bottom layer and then back to the top layer at the cfp2 connector as illustrated by the circled area in the above figure.
Just as there are tolerance considerations, placement restrictions and best design practices for components and traces, so too for multilayer routing of bga connections and using vias. Cam artwork screen shots 64ball csbga layer 1 primary layer 2 signal. The first row the outside row supports any size trace desired. An easy and also efficient pcb layout software for every electronic engineer.
Thats right, you can learn the principles for successful bga routing in just 30 minutes. Escape your ball grid arrays bga in seconds, not hours. It also provides space for 0201 decoupling caps to be placed directly opposite the bga pins. Bga packages for embedded design has evolved significantly over the years, to keep up with the technological progression of chip manufacturers. While the fistbumps will be digital, the tactics youll learn will be just as real as if you were with us in the session or getting a demo in our booth on. Inducted into the pcb design hall of fame in may of 20, by the up media group for my contribution to pcb design software. Very large bgas, over 1500 pins, present a unique challenge for routing on a printed circuit board. Specifically, the channel breakout underneath the ball grid array bga has an impact on. This could make your routing scheme more flexible than using a simple dog bone fanout. Currently, the standard for housing a variety of advanced and multifaceted semiconductor devices like fpgas and microprocessors is done through ball grid array bga device packaging. The cisco 8000 series includes two distinct router architectures that both. Such permissions, called enhanced rights in adobe connect, are available by default on the share pod, on the notes pod, on the whiteboard, on the file share pod, and for audio and video sharing when a breakout session starts. It runs, never goes above 0% and then the routing window goes away or the eagle program as a whole crashes. It provides up to 144 ports of 100 gbe via breakout and supports.
He was the original product architect of expedition pcb, and an inventor of team pcb, xtremepcb, xtremear, and the sketch router. The daring escape from the notorious civil war prison new. Pads tool for viewing the bga breakout and routing. When combined with the case of arc routing and a rotated component shown above, you can break out of a bga in any way. Use of fullstack vias cause the routing of most nets to. Wrote a design book titled, bga breakouts and routing. If you want to see traces pads and holes in 3d, i know charles pfiels illustrations in his book bga breakouts and routing had some beautiful examples of that, but im sure it wasnt freeware or shareware that created them. The fanning out and adding standard size vias and trace width and spacing will take up a lot of room around the bga.
In fanout and escape routing pcb design, the two outermost rows, and all other rows of a bga fanout routing, are automatically connected to the center of the terminals via a short circuit trace that is executed at a 45 degree angle. You may need an extra routing layer for each two rows of bga pins in order to completely fanout the bga. It has 45 mil tracespace, with 4mil lasers and 8mil pads. That page from altium has some good tips and shows how to use their tools to help. Often just routing out of the bga is the primary contributor to the number of layers required for routing.
Effective design methods for very large bgas charles pfeil on free shipping on qualifying offers. Autodesk eagle premium 2020 free download decorate usability and skills with one of the scripts or packages created with the aid of the goodsized online pcb network. Download a copy of highspeed constraint values and pcb layout methods by charles pfeil, which encompasses lessons learned from his five decades in pcb design. Based on the cisco global cloud index, digitalization is projected to grow global data center and publicprivate cloud networks traffic more than 25 percent annually, resulting in a threefold increase by 2019. Breakout s02e08 southsider gang escape video dailymotion. A sudden manifestation or increase, as of a disease. You should be able to use a 6 mil via drill and route the signals on the inner layers using 3. Breakout board, descriptions of the onboard connectors, and a complete set of. Tips for routing bga packages that wont leave you puzzled.
Fanout and escape routing is integrated in many pcb design systems to enable further connections. Breakout the combination of fanouts and escape traces, which allow routing out of the bga pin array to the perimeter of the device prior to general routing of the pcb. The unique outer row routing and the via channel inner routing are two important parts of this technology on the omap35x. This application note compares several serial channel breakout routing techniques to help you meet 10 gbps to 28 gbps data rate channel performance while balancing the performance versus cost tradeoffs. Figure 21 cam artwork screen shots 381 ball cabga layer 1. When you breakout a bga, you basically apply a fanout solution and route traces from those fanouts to the perimeter of the device prior to general routing of the pcb. Breakout definition of breakout by medical dictionary. Squeeze your existing blocks of circuitry in a snap. The book provides the underlying equations and specializes in practical solutions for reallife signal problems. To type a question for hosts in the same breakout room, use the chat pod menu to send a message to the host. To verbally ask a host in the same breakout room a question, use the audio provided voip or telephony. I use the term bga breakout to describe a fanout design solution that routes escape traces from fanouts to the perimeter of the device prior to general routing of the pcb. Because of that, these traces should only be used near the device for breakout and not generally across the entire printed circuit board.
Bga routing guidelines best practices for via design. Pcb breakout routing for highdensity serial channel. The last few weeks have been a whirlwind of canceled events and anxiety for all of us. Figure 1 illustrates the complexity of the bga breakout problem. Bga breakouts and routing advanced electronic technology.
1036 1408 270 488 553 1273 819 858 923 920 318 260 936 233 410 1172 86 202 826 708 213 1174 117 1022 1081 229 848 602 239 937 441 693 311 1241 91 701 76