Hi Martin,
About the design for HSIC use with iMX6 you can refer to http://cache.freescale.com/files/32bit/doc/app_note/AN4589.pdf?fpsp=1&WT_TYPE=Application%20Notes&WT....
And the setting of NVCC_RGMII voltage you'd better to check it in i.mx6 Reference Manual.
Hope this can help you. Have a great day~~
Best Regards
Dan
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