JohnSwenson wrote: 
> That's rather interesting. That means the SPDIF output is using the USB
> PLL rather than the audio PLL.

Yes, that's documented in the ref manual too, that spdif0_clk_root is
from PLL3 (the USB PLL). PLL PFD3 is where the 454.7MHz (mentioned in
that code comment I already posted) is derived from.  As far as I can
see, if we do not wish to use spdif0_clk_root, our other TX clock
choices are.....

000 XTAL clk input
001 CCM spdif0_clk_root input
010 asrc_clk input
011 spdif_extclk input, from pads
100 esai_hckt input
101 frequency divided ipg_clk input
110 mlb_clk input
111 mlb phy clk input


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