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iMX6 RGMII level

Question asked by Pavel Ivanchenko on Oct 26, 2012
Latest reply on Sep 26, 2018 by zhang han

Datasheet have "RGMII I/O supply voltage: 1.14 - 1.5 - 1.9V"

But as i know, some boards with iMX6 have  KSZ9021RN ethernet PHY and it have RGMII IO 2.5/3.3V

I can't find datasheet of AR8031 for understanding how RGMII IO supply in development board, but as i know RGMII IO 1.5-1.8V it only for RGMII V2.0 specification but brief pdf of  AR8031 dont have RGMII V2.0

What volages can be supply to   RGMII I/O?