Originally posted by reh321 that could provide a major explanation for why their cameras lag behind Canikon in AF
Not so much, I think. If you have a simple AF sensor (eg 11 point Canon 6D or Pentax K-50), there will be hardly anything to do for a dedicated AF DSP, so it would be a waste of silicon and battery power to install a dedicated AF DSP. You don't need a dedicated DSP for a toaster, for example, because it's capabilities are limited, as is it's mission.
But once you target the camera to sports shooting pros, and start piling on the inputs and work for the camera's AF (65+ AF points feeding in data, the 100k+ metering sensor feeding data into the AF calculations, face detection working away in PDAF, multiple subject tracking algorithms and options, managing dual-pixel AF in Canon's case, doing continuous AF in video, etc etc) and the need to deliver all of that at 20MP and 10 fps or something, then it makes a lot of sense to off-load that work onto a dedicated chip.
Pentax simply isn't at the point, I believe, where they have a camera that would be able to offer enough work for a dedicated AF data processing chip - yet.