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Heracles is an open-source complete multicore system written in Verilog. It is fully parameterized and can be reconfigured and synthesized into different topologies and sizes. Each processing node has a 7-stage pipeline, fully bypassed, microprocessor running the MIPS-III ISA, a 4-stage input-buffer, virtual-channel router, and a local variable-size shared memory. The design is highly modular with clear interfaces between the core, the memory hierarchy, and the on-chip network. In the baseline design, the microprocessor is attached to two caches, one instruction cache and one data cache, which are oblivious to the global memory organization.
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