topic Re: S32G-VNP-RDB3 GMAC in S32G

S32G-VNP-RDB3 GMAC

dongmin — Mon, 04 May 2026 05:03:04 GMT

Hi, I'm doing Frame Preemption with GMAC with the S32G-VNP-RDB3 board, but I succeeded with 1G bps. But I'm going to change it to 10M bps, but I can't, so does the limit have to be 1G bps?

Re: S32G-VNP-RDB3 GMAC

alejandro_e — Tue, 05 May 2026 01:00:54 GMT

Hello @dongmin,

Thanks for reaching out to us. About your question, the preemption configuration is not exclusively for 1G bps. I was able to quickly modify the Gmac_Ip_InternalLoopback, to use preemption and 10M bps and it worked. Please share the following information so I can help you more:

What do you mean when you say you "can't" configure it for 10M bps?
Please describe how you are testing both configuration.
Please share on which core you are running your application.
Please share your RTD and/or BSP version.

Thanks.

Re: S32G-VNP-RDB3 GMAC

dongmin — Tue, 05 May 2026 01:10:11 GMT

First of all, thank you for your answer. I had two S32G-VNP-RDB3 boards and connected GMAC to each other on a 1:1 link, and then proceeded with frame preemption. Core proceeded with M core. I proceeded without using loopback. At this time, I set the clock and settings like a picture, but I saw a phenomenon where the handshake for frame preemption did not occur at this time, just like tx,rx. I need a solution!