6 Layer Layout VIA Using Problem

[FurkanDursun]

Hello Dear Fedevel Family,


I have 6 layer PCB design which includes a lot of interfaces. When I want to use via in my layout, via automatically jump from layer 1 to layer 4. I can't use layer 2 and layer 3. I don't want to use buried and blind VIAs because of price and time. If are there any options, can anyone explain me? I don't know why I don't use layer 2 and layer 3 exactly. Does anyone know why I couldn't use layer 2 and 3?
My stackup and example screen shoot will attach bellow.

Lakshmi
robertferanec
Paul van Avesaath

[robertferanec]

It means 1 to 6. You can use any layer between 1 and 6 (including 1 and 6).

[FurkanDursun]

It means 1 to 6. You can use any layer between 1 and 6 (including 1 and 6).

Thank you, Robert, but my question was about " layer 2 and layer 3". I could not use these layers. I checked my rules, my rules are wouldn't allow me routing on layer 2 and layer 3. I don't know why, but I changed rules and now I can use these layers. Do you know why these layers were not let me? Why did rule set as not checked?

[robertferanec]

Interesting. I have never used these rules and I have never seen anything to change them. I am not sure what happen in your case. But, you solved it and that is great!

[shaik]

This happen for any of the two reasons
1. when layers are defined as planes, then you can't rout on these layers. (check stack-up and define as layers)
2. Check all layers are selected for routing in design rules

Thanks...