Customizing the core

Why is there no option to customize SiFive S76 core on SiFive official website?
Is there some very basic reason which I am missing here?

Hi Vishal,

We are currently working on enabling the full customization features of the SiFive Core IP 7 series through the Core Designer web application, and we are planning to make this available soon. In the meantime, if you are interested in a custom 7 series core, we would be happy to work with you over email to understand your needs and provide you with a custom core sooner. Feel free to send us an email at

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Oh okay, I see. Thank you Richard.

Hi Richard,

Is it possible for us to develop new interconnect network while customizing a new CPU?

Hi Alvyn,

Yes, you should be able to use any interconnect system with SiFive’s RISC-V cores. Our cores natively use the TileLink protocol, but we also provide adapters for the AXI, AHB, and APB protocols, which you can select as a Core Designer customization option. If you have a different protocol that you want to support, the TileLink specification is open, and you can find the latest version of it on our website at If you have further technical questions about your use case, please feel free to send an email to, and we can connect you to someone who can help.

Also, in the future, I would kindly ask that you create a new forum topic for new questions, since that makes it easier for people to search for existing questions.