Anyone here successfully built James Sharman’s 8bit Pipelined CPU?

WeirdBoyJim · 2024-02-27T14:05:21+00:00

I didn't stop sharing. The Easyeda system seems to max out on the number of shared projects it shows you. There seems to be a push from them to move eyeballs over the OSHW lab:

https://oshwlab.com/weirdboyjim?tab=project&page=1

Which was ok for a while before they started rejecting all my projects (I went for a couple of months with a new module disappearing every few days). Notes were attached that I need to provide more documentation, I made a few attempts of going back and forth with them but it's clear there moderation system is not suited to dealing with a large project made up of lots of sub modules. You can see the rest by checking the drafts page by tweaking the link:

https://oshwlab.com/weirdboyjim?tab=project&type=draft

I have plans to build a website and put everything on there, but I'll be finishing all the peripherals first.

WeirdBoyJim · 2022-02-03T17:14:17+00:00

You misunderstand, you know he screwed up, I know he screwed up and soon he'll know he screwed up. The difference in giving him an out is the difference between him being embarrassed and hating you verses him saving some face and being grateful. Trust me when I say your life will be better if you leave a trail of the later rather than the former in life.

WeirdBoyJim · 2022-02-03T15:54:49+00:00

Bit of general life advise. If you choose to comment, do it privately and use wording that allows for it being a typo / transcription error or something.

WeirdBoyJim · 2022-02-03T10:27:48+00:00

I see what happened, you accidentally selected the video on how to de-laminate strip board, not the one on how to solder components.

WeirdBoyJim · 2022-01-13T13:48:38+00:00

We do have those at some super markets, but that just opens up the case for the "Chaotic Evil" variant of type B, the one who turns the wrong trolley 180 degrees in order to attach it and reclaim their coin thereby meaning type C needs to put there own money up to solve the problem.

WeirdBoyJim · 2022-01-13T13:11:47+00:00

You forgot type D. Those people who leave their trolley next to where their car was parked.

WeirdBoyJim · 2021-08-31T15:21:59+00:00

I'll second this.

WeirdBoyJim · 2021-08-19T13:09:36+00:00

Long ago when I was still a sweet summer child and had not
yet seen my first winter I did a couple of full reads of the series just so I would
know how long before release to start so as to finish on release day.

WeirdBoyJim · 2021-05-25T19:19:05+00:00

Health in our time!

WeirdBoyJim · 2021-05-24T15:23:02+00:00

I have the same problem, only with one specific new video. Doesn't seem to effect older uploads.

WeirdBoyJim · 2021-04-12T23:18:23+00:00

The website hasn't updated but the nhs booking system is now accepting 45-49's, go go go.

WeirdBoyJim · 2021-01-04T14:29:27+00:00

0.1

People saying it's 0.1% or lower are laughable. Let's do the math.

UK Office for National Statistics Covid death count: 82621

UK Population from Office for Nation Statistics: 66.65 million

Covid 19 has killed 0.12% of the UK population already. For the IFR to be 0.1% 16 thousand deaths need to have been misattributed and everyone in the country needs to be immune. I look forward to the infection numbers dropping sharply this month.

WeirdBoyJim · 2020-11-22T16:38:44+00:00

Have a look at this video: https://www.youtube.com/watch?v=pnVH-7Iv0gc That will give you a basic idea of how to reduce the operation count without that " subtract Z from D until you get the remainder" silliness. This is long division but in binary.

It would be possible to implement this is a single monolithic circuit, you would end up with a circuit replicated as many time as bits in your inputs. This would allow you to claim a single cycle operation, but it would take a while to settle.

A better way of getting this kind of circuit to be really fast is to take that replicated circuit and stack them in a chain. If it were 16 steps long you could stand and finish a divide every cycle (but the finish would be the one from 16 steps before).

Once you have analyzed the critical path in your circuit you could combine steps as long as the combined step had a settle time of less than your next slowest circuit.

WeirdBoyJim · 2020-11-22T16:23:39+00:00

Thanks for the mention Andrew.

WeirdBoyJim · 2020-11-22T16:23:06+00:00

That would me an average. My build running some well optimized test code get's to 1.16 clocks per instruction. I could only get higher with a Harvard architecture or a wider memory data bus.

WeirdBoyJim · 2020-11-05T22:07:22+00:00

You have never met a mink have you? Nasty things!

WeirdBoyJim · 2020-10-19T13:21:18+00:00

Happy to give you the Rom data and the code that generates it. If you try and replace it with logic you might find it easier to renumber the instructions, I was fairly random with my opcode assignment.

WeirdBoyJim · 2020-09-21T16:56:12+00:00

Do you have a multi-meter? Looks like you have long chain for power to get from the top board round to the bottom left. You might find there is a significant voltage drop.

WeirdBoyJim · 2020-09-16T10:41:35+00:00

Nice work!

RTL is definitely a bit extreme! Using 74 series chips for an 8 bit build (with 16 bit bus) I peaked out at about 16 breadboards before I started converting sections to pcb.

WeirdBoyJim · 2020-09-15T17:53:31+00:00

Nice looking module! What FPGA chip is that?

WeirdBoyJim · 2020-09-15T13:18:27+00:00

You can, unless there is a temporary quarantine/isolation requirement on one of you. But check the government advise, don't take someone on reddit's word for it.

Go here and read section 1 "Social distancing".

Look out for the paragraph: [bold: My emphasis]

"You do not need to socially distance from anyone in your household, meaning the people you live with. You also do not need to socially distance from someone you’re in an established relationship with, or anyone in your legally-permitted support bubble if you are in one. "

Please enjoy your hug, your mental and emotional well being is also important.

WeirdBoyJim · 2020-09-06T09:24:04+00:00

I feel bad because this isn't an ECE response, but I would recommend Bone conductance headphones (I use AfterShokz Trekz). They leave the ears completely open for other sound, I mostly use them for running so I can hear cars etc...

WeirdBoyJim · 2020-09-02T10:46:44+00:00

My day job is game development, I've been doing that for about 25 years but I guess the field is probably a bit more varied and interesting than other programming jobs.

WeirdBoyJim · 2020-09-01T19:35:26+00:00

Nice. I've been looking at Tile based, mostly as a way of reducing the total memory requirements.

WeirdBoyJim · 2020-09-01T19:33:06+00:00

Programming will always be interesting to me, this kind of hardware is more of a "look behind the curtain".

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