>>513030695
Here's that block diagram by the way.

Just read into basic combinational logic (Don't be an idiot like me, who just learnt the basic logic gates as a cursory mention in 10th or 11th grade maths and then tried to develop digital circuits in logisim for combinational logic problems like 7 segs and addition, subtraction, multiplication (couldn't figure out division at the time) in th3 most horribly unoptimised ways. It's only when I did study into the subject later that I realised how stupid I am.) Alongside the 650x manuals and this block diagram and it'll all automatically teach you sequential logic and everything else you need to know to design your own cpu. There's still a lot more like OoO, which I had to look up, and other things that aren't emergent from digital properties but physical ones like caching, but you'll be able to design something equivalent to an i386, only smaller, with that alone.