The following images show a typical PCIe® BGA breakout. The TX is the red trace on layer 3, and the RX is the blue trace on layer 5.
Figure 1. Standard Diagonal Jog Via Structure
Note: The color highlight shows the
proximity of the noise source and the noise recipient in the order of amplitude (red,
yellow, or white), with red having the worst crosstalk.
Figure 2. Diamond Jog Via Structure
Note: The color highlight shows the
reduction in proximity of the noise source and the noise recipient.