> > Am I correct in thinking that a SATA controller would be easier and faster 
> > to
> > design than a graphics/video controller, and that it would cost 
> > significantly
> > less to get an ASIC fabbed?
> 
> Is it anything more than a parallel to serial and serial to parallel 
> converter. a DMA controller, and the line transceiver?

The SATA controller is involved in NCQ.
I suspect it is involved in error detection/correction?
It might be involved in handling port multipliers?
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