SiFive announced today that it has joined GLOBALFOUNDRIES’ FDXcelerator™ Partner Program, and will be making RISC-V CPU IP including SiFive’s E31 and E51 RISC-V cores available on GF’s 22FDX® process technology. Based on the open source RISC-V ISA, the SiFive E31 offers embedded chip designers new capabilities in high performance within strict area and power requirements, and the SiFive E51 offers a full 64-bit performance at 32-bit price, power and area.
https://www.sifive.com/posts/2017/11/28/sifive-joins-fdxcelerator-program-to-bring-risc-v-core-ip-to-globalfoundries-22fdx-process-technology/