Need advice on selecting a PCB stackup

[swen_s]

I would need advice in deciding what PCB stackup to use for my project.

I have two voltages (5V and 3.3V) and some LVDS (differential signals).

Is this a good stackup?

Layer 1: Components, small routing near ICs. I have also some signals that need to be 100 ohm (differential impedance). These I would like to route on the top layer to avoid using vias on these signals. The differential signals cut through the whole top layer and makes it impossible to route other signals in that area.

Layer 2: GND (to be able to route microstrips on the top layer)

Layer 3: X routing

Layer 4: GND (this is a shared plane for the X and Y routing)

Layer 5: Y routing

Layer 6: 3.3V

Layer 7: 5V

Layer 8: Components and small routing near ICs.

 

[lazyzyf]

Ｉthink layer7 can be set to GND,3.3v and 5v can be in the same layer.Just my own opinion.

 

[kabaleevisu]

Hi
how many components and nets is available right now if 3.3v and 5v is distribute in whole board 8 layer is ok in case it is not distribute 6 layer is better