RISC-V: why an open chip instruction set is a big deal

Most of the chips in your life run on instruction sets you're not allowed to look at, let alone build on. The instruction set, the fundamental vocabulary a processor understands, has historically been proprietary, licensed for large sums under tight terms. RISC-V (pronounced "risk five") breaks that model: it's an open, free instruction set architecture that anyone can implement, extend, or build a business on without paying a licence fee or asking permission.

That single fact is reshaping how new silicon gets designed, and it's why we think it matters for anyone training to work in this field.

What "open ISA" really means

An instruction set architecture (ISA) is the contract between hardware and software: the list of operations a processor exposes, like "add these two registers" or "load this value from memory." Software is compiled down to these instructions; hardware is built to execute them.

RISC-V being open doesn't mean the chips are free or that designs are automatically shared. It means the contract is public and unencumbered. You can build a tiny microcontroller core or a massive server CPU to the same base spec, and nobody can stop you or bill you for the ISA itself. What you build on top, your specific microarchitecture, can still be your proprietary, valuable IP.

Why companies are adopting it

• No licence tax. For high-volume or cost-sensitive products, removing per-core royalties changes the economics.
• Custom instructions. RISC-V leaves room to add your own instructions for a specific workload, say, a crypto operation or a signal-processing primitive, and get hardware-level speedups without leaving the ecosystem.
• Control and longevity. You're not exposed to a single vendor's roadmap or business decisions. For defence and industrial systems with decade-long lifespans, that independence is strategically valuable.
• A growing ecosystem. Compilers, operating systems, debuggers, and a global community now support it seriously, the chicken-and-egg problem that kills most new architectures has largely been solved.

The honest trade-offs

It isn't magic. The openness that makes RISC-V flexible also means fragmentation risk, if everyone adds their own incompatible extensions, software portability suffers, which is why the standard extensions and profiles matter so much. And the surrounding ecosystem, while strong and improving fast, is still younger than the decades-old toolchains around the incumbents. Building a competitive high-performance core is still enormously hard engineering; the open ISA gives you the starting line, not the finish.

Why it's central to how we train engineers

Here's the part we care about most. Because RISC-V is open, a student can actually see a complete, real instruction set, read open-source cores, and even implement one, something that was practically impossible with proprietary ISAs. For teaching RTL design, verification, and computer architecture, that's transformative: you can learn on the real thing instead of a toy. It's one reason RISC-V threads through our skill-centre tracks, and why we think the engineers who understand it deeply will have an outsized advantage over the next decade.

This is an engineering primer reflecting how we think about the problem space at Ivarix. Standards evolve, check current specifications before designing to them.