On ref-design mc1381 I have noticed that there are serial resistors on every single lane SDRAM D & A bus, 33ohm resistors. eMMC Data lines, 22ohms serial resistors. Is the argument for the resistors to reduce "ringing" in lane ?

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Peter BENSCHBest answer

ST Technical Moderator

These resistors realize the termination to match the line impedance to the MCU. You can find various application notes as well as considerations like e.g. on Stackexchange.

Does it answer your question?

Regards

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Peter BENSCHBest answer

ST Technical Moderator

These resistors realize the termination to match the line impedance to the MCU. You can find various application notes as well as considerations like e.g. on Stackexchange.

Does it answer your question?

Regards

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

BHell.1Author

Associate II

Thank you! Great.

Peter BENSCH

ST Technical Moderator

You're welcome!

If the problem is solved, please mark this thread as answered by selecting Select as best, as also explained here. This will help other users find that answer faster.

Good luck!

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

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