S32K388 RGMII

AB5 — Sun, 15 Jun 2025 10:59:08 GMT

Hi,

We want to connect the S32K388 RGMII interface to an ASIC RGMII interface in a MAC to MAC connection.

The S32K388 RGMII is 3.3V while the ASIC is 1.8V. Any idea how to resolve this?

Re: S32K388 RGMII

PavelL — Mon, 16 Jun 2025 10:26:51 GMT

Hello @AB5 ,

For RGMII (Reduced Gigabit Media Independent Interface), the level shifters must meet specific requirements:

Low propagation delay to maintain tight timing margins (RGMII operates at 125 MHz DDR).
Push-pull outputs (not open-drain) to support high-speed signal integrity.
Direction-controlled or fixed-direction operation (auto-direction sensing introduces too much latency).
Voltage translation from 3.3V to 1.8V (or vice versa, depending on PHY/SoC I/O levels).

Device like the 74ALVC164245 from Nexperia can be a good candidate.

Best regards,

Pavel