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Ibex is a small 32 bit RISC-V CPU core, previously known as zero-riscy.
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Philipp Wagner e9e5a719bc Move RTL code into rtl/ directory 
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README.md

ibex: RISC-V Core

ibex is a small 2-stage RISC-V core derived from RI5CY.

ibex fully implements the RV32IMC instruction set and a minimal set of RISCV privileged specifications. ibex can be configured to be very small by disabling the RV32M extensions and by activating the RV32E extensions. This configuration is called micro-riscy

The core was developed as part of the PULP platform for energy-efficient computing and is currently used as the control core for PULP and PULPino.

Documentation

A datasheet that explains the most important features of the core can be found in the doc folder.