SSD controllers aren't just moving a lot of data. Between the PCIe PHY and the ONFI PHY there's a lot of other functionality. In particular, doing LDPC decoding

SSD controllers aren't just moving a lot of data. Between the PCIe PHY and the ONFI PHY there's a lot of other functionality. In particular, doing LDPC decoding at 16GB/s (128Gb/s) is not trivial.