There is great excitement in the world of microprocessors, surrounding the RISC-V architecture. This is an open source modular instruction set specification that has seen implementations on FPGAs, and is starting to emerge in dedicated silicon.
If you are not yet up to speed on what is probably going to be the most important microprocessor development of a generation, you should watch this video. As [Robert Baruch] sets out to demonstrate, the combination of RISC technology and a modular instruction set means that the simplest processor compliant with the RISC-V specification can be surprisingly accessible. And to demonstrate this he’s building one from LSI and MSI
TTL CMOS chips, something we’d more usually expect to see in a recreation of a much older architecture.
The video below the break is the first of a forthcoming series, and in it he introduces the project and gives us an easily-understandable overview of RISC-V before explaining the mechanics of a register for his RISC-V implementation. This will be his first module, and he’s created a PCB for it. He runs through its design, his choice of indicator LEDs, and then his choice of PCB house. There is also a breakout board, with two of the PCI sockets he’ll be using for his backplane. Finally we see the board being tested, with LEDs lighting up in response to values being stored in a completed register.
[Robert] has appeared on these pages many times before, among the most recent with his TMS9900-based breadboard computer. This build moves away from his retro fare though, and should be well worth watching for future installments.