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deepmind.google·6d ago
AI Engineering
Hacker News·15d ago·5 min read
Running Doom on Our Custom CPU and Going Viral
TL;DR
A custom CPU was built from scratch to run DOOM, overcoming challenges in memory and speed. The team adapted the game’s source code and deployed it on an FPGA.
✦ Why It Matters
Engineers can explore custom CPU designs to tackle specific performance challenges in embedded systems.
Key Takeaways
- Explore custom CPU design for unique software applications.
- Implement caching strategies to optimize memory access speed.
- Utilize FPGA for rapid prototyping of hardware solutions.
- Focus on pipeline optimization to enhance processing efficiency.
How It Works
The custom CPU employs a 5-stage pipeline architecture, which includes stages for instruction fetch, decode, execution, and writeback. Memory operations are abstracted through a unified interface, allowing for efficient handling of both instruction and data caches.
The use of a cache system significantly reduces the latency associated with slower DDR3 memory, enabling the CPU to fetch and execute instructions more effectively.