@xiongmi Yes, you can combine. The _L and _R identify the quad groups of MGT's connected and if aren't using a specific quad. you can leave that group of Power supply (i.e. _L or _R) either unconnected or tied to GND.
Review Analog Power Supply Pins section from Page#315 of UG576 v1.5.1 which elaborates in detail.
- Giri
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There's no such thing as a stupid question. Feel free to ask but do a quick search to make sure it ain't already answered.
Keep conversing, give Kudos and Accept Solution when you get one.
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