There are multiple open source implementations of it available, written in hardware description languages. You can program those on to an FPGA or even make an A

There are multiple open source implementations of it available, written in hardware description languages. You can program those on to an FPGA or even make an ASIC if your budget extends to that. The http://www.lowrisc.org/ http://www.lowrisc.org/ lowRisc guys are working on an ASIC if you need a real chip.