I think the 18 is counting 16 Epiphany cores plus 2 cores on the Zynq. The 64 is referring to a 64 core Epiphany chip that has only been made in prototype quant

I think the 18 is counting 16 Epiphany cores plus 2 cores on the Zynq. The 64 is referring to a 64 core Epiphany chip that has only been made in prototype quantities, so far as I know.