AM4376: Low cost PCB rules

Hello NY,

Thank you for the query.

how package of AM4376 is considering ball pitch and the other package key factors

Please elaborate the query.

Regards,

Sreenivasa,

Dear Sreenivasa san

Thanks for your reply. I am the customer.

AM4376 has a ball pitch of 0.65mm, so to place a via between the balls, we need to use a special via with a hole diameter of 0.1mm.

Please let me know if there is a way to design a board with only standard via with a hole diameter of 0.25mm, using the open area for the balls.

Thank you.

Kazuaki Totsuka

Hello NY,

Thank you for the note.

Have you had a chance to analyze the EVM? What is the target layer count you have in mind?

Regards,

Sreenivasa,

Dear Sreenivasa san

Thanks for your reply.

EVM is unconfirmed.

I am guessing that perhaps special size vias or buildups are used.

I would like to design with 6 layers and standard size through vias.

Any good ideas for cost saving?

Thank you.

Kazuaki Totsuka

Hello NY,

Thank you for the note.

I know customer are using 8 layers for the AM43x. Not sure if we have any reference for 6 layers.

Let me check internally if we have any inputs to share although i believe we do not have any.

To get an idea on the constrains please refer to the below AM57x implementation on 6 layers

(23) AM5706: 6 Layer Stack Up Defining Impedance Requirements - Processors forum - Processors - TI E2E support forums

Regards,

Sreenivasa,

Dear Sreenivasa san

Thank you for the documentation.

6 layers have been proven in our current products.

What we want to check this time is if there is an idea to use standard via with 0.25mm hole diameter.

As per the material you gave us, it is impossible to place standard vias between the ball pads, but if you have any ideas to use the blank area without balls, please let us know.

Thank you.

Kazuaki Totsuka

Hello NY,

Thank you for the note.

I do not have any additional information to share or suggestions to make.

Please let us know if you have any additional questions.

For my understanding, do you have the AM4376 based design in 6 layers.

Regards,

Sreenivasa

Dear Sreenivasa san

Thanks for your reply.

Yes, 6 layers is our standard.

We will proceed with our study based on the information you provided.

Thank you.

Kazuaki Totsuka

Hello NY,

Thank you for the note and agree.

For my understanding, do you have the AM4376 based design in 6 layers.

Regards,

Sreenivasa,

Dear Sreenivasa san

Sorry for my late reply.

> do you have the AM4376 based design in 6 layers.

Yes, we have already designed in 6-layers.

I agree to close the thread.

Thank you for your response.

Kazuaki Totsuka