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Does SJA1105 RGMII support 3.3V signaling?

Question asked by Andreas Hofer on Oct 2, 2019
Latest reply on Oct 3, 2019 by Bulat Karymov

We need a Ethernet switch whose RGMII interfaces are able to operate at 3.3V. The IEEE802.3 standard specifies 2.5 voltage levels for RGMII but all PHYs that I found so far also support 3.3V.


The SJA1105 would fit very well in our application but we are unsure wether it supports RGMII with 3.3V voltage level.

While the SJA1105P datasheet  page 3 specifies 3.3V for MII, RMII and RGMII for the SJA1105, the SJA1105 datasheet specifies 2.5V on page 16.


My guess (and my hope) is that NXP just repeats the standard's values in the SJA1105 datasheet, while it is still possible to operate it's RGMII at 3.3V.


Can anybody please confirm that the SJA1105 supports 3.3V voltage levels also in RGMII mode?