Can VDDIOT (RGMII interface supply) on the XEF216 be powered from 3.3V? The datasheet seems to indicate that it can (two different ranges are listed in table 14.1 - one for 2.5V and one for 3.3V) and section H.5 on page 74 says "VDDIOT has a 2.5V or 3.3V supply as appropriate", however there is a seemingly contradictory statement in section 13 (Board Integration) - "...VDDIOT powers the RGMII IO pins, and must be provided with 2.5V".
Thanks!
Clarification on allowable VDDIOT in XEF216 datasheet
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chouston00
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infiniteimprobability
- XCore Legend
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Hi, Yes 3v3 is fine VDDIOT. It only must be 2.5V when interfacing to RGMII. If you're using it as GPIO then 3v3 is OK.
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chouston00
- Junior Member
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Is 3.3V allowable when using the RGMII and interfacing to a phy that supports 3.3V RGMII?
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infiniteimprobability
- XCore Legend
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Hi, yes that's fine. Timing was closed at 2.5V and the standard says 2.5V, but the ports will be faster at a higher voltage (which is allowed on the I/O) so it will be OK.