May 29, 2024


The Joy of Technology

Scott’s CPU From The Bottom Up


I don't know how CPUs work so I simulated one in code - djhworld

It isn’t for everyone, but if you operate a great deal with computer systems at a minimal level, you’ll almost certainly sooner or later entertain the notion of producing your personal CPU. There was a time when that was a large undertaking, but with today’s resources and FPGAs it is… very well, not quick, but absolutely much easier. If you have the urge to try your very own, you may well have a look at [Simply Explained’s] video clip sequence referred to as “Creating Scott’s CPU.

The 11 movies address almost everything from fundamental transistor logic to sequential circuits and moves on to factors like ALUs, clock units, and how jump directions function.

We are guessing there are some far more video clips forthcoming. Even so, these 11 films are over two hrs of articles and that is a ton to get you begun. Of training course, absolutely everyone who does this typically focuses on 1 style of architecture by necessity but there are many ways you can design and style a CPU. A lot of homebrew types are very simple various clock for each instructions patterns. A several use pipelining to get an instruction for every clock the moment the pipeline fills up. Modern day CPUs do a lot of tips to truly execute, on normal, a number of guidance per clock cycle, but that complicates a ton of things.

Then there are the non-traditional architectures like single-instruction pcs or asynchronous CPUs. The point is, at the time you know how a basic CPU will work, there is nevertheless a good deal of space to innovate in your possess structure.

We’ve been by this training much more than once and — in our impression — the toughest part isn’t developing the CPU. It is building all the ancillary resources you want to do something handy. There are some hacks to make that less difficult. On the other hand, it is possible to do every little thing from A to Z.


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