How/where to disign a microcontroler?

After I made an advanced operating system the next crazy idea is to make a microcontroller. I want to design them and they send the design to a manufacturer to create the chip (I want to have as basic components transistors). So where to design it and to send it (to create the chip) ?

Your question is so naive.
Do you have a background in digital circuit design?

you starting point would be google search "How to build a micro-controller from scratch"

ARISTOS said:

After I made an advanced operating system the next crazy idea is to make a microcontroller. I want to design them and they send the design to a manufacturer to create the chip (I want to have as basic components transistors). So where to design it and to send it (to create the chip) ?

Click to expand...

this is virtually impossible unless you are in a university/company setting. the licenses to the required tools alone would be in hundreds of thousands of dollars. plus, good luck convincing a foundry to give you access to their IP/PDK.

It also costs thousands and thousands and thousands of dollars to fab the chip. Maybe you should think about putting your grand design into an FPGA.

ARISTOS said:

...the next crazy idea is to make a microcontroller...

Click to expand...

Yes, this is a crazy idea.

Unless you are part of a billionaire family and have your own ridiculously large trust fund that you can access for any "crazy" idea that you come up with I highly doubt you'll manage to do this on any reasonable individual budget.

I think you should instead donate the millions you will waste, building your own microcontroller, on the top 10 posters of the month on edaboard ;-)

There are open source uC designs aplenty and you
could turn the crank on any of them with whatever
features you think you want or want to eliminate.

Studying them would be instructive, as far as the
reinvention of wheels goes.

A multiproject run giving you tens of dice will set
you back maybe $20K on a far-from-leading-edge
process.

You would presumably want to have a test solution
for wafer probe and packaged part screening. If no
then you confound the development with the
uncertainty of whether any given part is any good.
Tends to make software debug tricky, when you
have no idea whether the uC is itself correct. That
development tends to run to months of engineering
effort (and that's with experienced test engineers
who have been provided the information they need
and the budget for hardware build and test floor
access (presumably you will need to rent the gear
and the operators).

Figure anywhere from $25K for a mid-tier tool set
like Tanner or Silvaco, to $200K+ for Cadence or
Mentor/Synopsys/??? per year.

Now why you'd be looking to do this, when your
end result is an inferior performance, $10K-a-pop
chip that has zero development environment
support (oh, right, your "advanced" OS - but
the compiler, debugger, etc. are ala carte, no?)
eludes me other than the thrill of it all. Like the
time back in the late '70s when I convinced myself
that building my own 8080A computer using wire-wrap
and STD44 cards was going to be really cool.

It wasn't.

This is one of those cases where, if you have to ask
the question, just don't.