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BrotherTheo
Associate II
July 2, 2026
Solved

STM32H7 SDRAM layout examples

Hello, I am new to high speed layout and am just learning a new layout tool so the pressure is on. What I need is some layout examples I can study to boost my chances of getting it right. Can anyone help please?

LCE
LCEBest answer
Principal III
July 2, 2026

If possible, use serial resistors on all signal lines.

Depending on the maximum clock rate, the length of all related tracks should be almost equal. And as short as possible.

Try to avoid vias, if not possible use the same number of vias for each line.

Try to keep the impedance of the tracks constant - and the same for all.

Each signal line must have an adjacent GND layer without any splits.

 

I’m quite happy with STM32H733 + HyperRAM, > 50 MB/s read / write, and less signal lines than some fully parallel interface.

 

Look for some tutorials, many semiconductor companies have some good layout guides.

 

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2 replies

Andrew Neil
Andrew Neil
Super User
July 2, 2026

Take a look at some ST boards ?

you’ll find Gerbers on the ‘CAD Resources’ tab of the Product Page for the board …

 

But the principles involved aren’t specific to STM32 - doesn’t your new layout tool have training, tutorials, examples, a forum…?

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
LCE
LCEBest answer
Principal III
July 2, 2026

If possible, use serial resistors on all signal lines.

Depending on the maximum clock rate, the length of all related tracks should be almost equal. And as short as possible.

Try to avoid vias, if not possible use the same number of vias for each line.

Try to keep the impedance of the tracks constant - and the same for all.

Each signal line must have an adjacent GND layer without any splits.

 

I’m quite happy with STM32H733 + HyperRAM, > 50 MB/s read / write, and less signal lines than some fully parallel interface.

 

Look for some tutorials, many semiconductor companies have some good layout guides.

 

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