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Routing ddr3 on 6 layers

Johnnyjax , 06-08-2020, 03:29 AM
What's the best way to route ddr3 with t-branch topology on 6 layers. Like the one on the imx6rex module.
chitransh92 , 06-11-2020, 03:08 AM
What do u mean by this??
Johnnyjax , 06-11-2020, 07:29 AM
In the advanced PCB layout course, robert routed the DDR3 chips on a 12 layer board and he used 4 layers to do the routing of the ADDR CMD CTRL signals of the DDR3 chips. He used layer 3 and 10 for the trunk and the T-branch and he used the top and bottom layer for the top branches. Which means he used 4 layers in total and i uploaded pictures to show this. I'm trying to design a 6 layer board and this is the stackup
layer 1 - signal
layer 2 - GND plane
layer 3 - signal
layer 4 - Power
layer 5 - GND plane
layer 6 - signal
This means i only have 3 layers as my signal layers and from roberts video, i need 4. How do i then route the DDR3 with a T-branch topology on a 6 layer board. What is the best way to route this.
robertferanec , 06-12-2020, 12:04 AM
Maybe bottom layer can be used + 1 inner layer + top layer for addr+ctrl+cmd+clk? But it depends on how many chips are connected and if it is possible to route all data on 1 inner layer only.
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