This video shows complete layout process of a module based on iMX6 Freescale CPU.
What you can see:
0:08 – 0:11 Memory fanouts
0:11 – 0:16 Processor fanouts, component placement under CPU
0:16 – 0:25 Two data banks of DDR3 are routed
0:25 – 0:29 Clocks, Command & Control signals of DDR3 are routed
0:29 – 0:34 Other two data banks of DDR3 are routed
0:34 – 0:39 CPU fanout, Ethernet fanout
0:39 – 0:41 HDMI routing
0:41 – 0:54 Connecting Ethernet and the top connector (UART, SD, USB, …)
0:54 – 1:10 Connecting the bottom connector (LVDS, PCIE, SATA, …)
1:10 – 1:25 Length matching
1:25 – 1:33 Creating Power planes
If you are interested, you can download this PCB layout files in Altium Designer from http://www.imx6rex.com/ – It’s free 🙂