4 ms·
Kinda does beg the question whether ten layers were really necessary, but I'm not a board designer.
by microcolonel 6y ago
Kinda does beg the question whether ten layers were really necessary, but I'm not a board designer.
- phendrenad2 6y agoI see a pretty fine-pitch BGA on there, so I'm guessing it is (but also not a designer)
- joezydeco 6y agoBGA isn’t usually the reason for 10 layers, it’s high speed signals like SDRAM that need isolation and timing.
- banks_h 6y agoNot sure why you're getting downvoted, you're dead on. I just finished routing an LPDDR4 bus (high speed + low voltage => worst case signal integrity) between two BGAs with signals routed on only 3 layers. The catch is that you need each high speed bus to be comfortably sandwiched between solid copper planes. Layers dedicated to reference planes start to add up quite quickly when you've got RAM, eMMC, ethernet, wifi, camera input, display output, SD card, etc all crossing over and through each other.