Is the i.mx6 RGMII version 2.0 compliant or version 1.3 compliant? It doesn't specify in the reference manual. It has a note about the differences between RGMII 1.3 and 2.0; however, it is unclear which it is.
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It appears to be RGMII 2.0. We didn't lengthen the clock line in our board and it works.
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