Issue link: https://iconnect007.uberflip.com/i/1489778
JANUARY 2023 I DESIGN007 MAGAZINE 13 At this stage, it should be pointed out that the stackup being employed is one that is proper from a signal integrity point of view (more on SI later). Figure 6 shows the first 12 layers of the sequence. In this figure you see that you need three microvia transitions to transition from Figure 4: Routing of the first internal signal layer. Figure 5: Routing of the first internal layer, continued. Figure 6: The first 12 layers of this sequence.