The European Accelerator (EPAC) demonstrator with 3 RISC-V based accelerators
summary
A taped-out RISC-V chip includes three accelerators (VTI scalar core + wide VPU, VRP, SDX) and boots standard Ubuntu Linux from a companion FPGA that provides DDR over a high-speed link because there is no on-chip memory controller. The demo runs a sparse matrix–vector kernel on a single 300 MHz core and shows 18x speedup when offloading to the VPU, which implements 256 double-precision lanes per vector instruction, with caches and NoC integrated and silicon fabricated and running on the demo board.
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