Tutorial 21 built a RISC-V core with one memory port, and tested it against a memory written in the testbench. Tutorial 22 built a Wishbone bus, and Tutorial 23 an AXI4-Lite register block. This ...

A CPU keeps the values it is working on in a small set of fast registers. An instruction such as ADD R1, R2 reads two of them and writes one back, all in a single clock. The hardware that does this is ...