It seems you can get a diagram of the actual circuit like this: 1. Go to https://edaplayground.com https://edaplayground.com 2. Paste the code in the right pa

It seems you can get a diagram of the actual circuit like this: 1. Go to https://edaplayground.com https://edaplayground.com 2. Paste the code in the right pane labeled "design.sv"; it's probably a good idea to reduce the number of registers to 2 to make the output more readable 3. On the left, select "Yosys" in tools and simulators (it seems to be the only one that works without additional configuration or fiddling) and enable "Show diagram after run" 4. Click "Run" and it should open an image with a graph rendering showing the circuit. If it doesn't work, try to disable adblockers or popup blockers (it opens the output as a pop-up apparently) You can also presumably run yosys locally. In this case, it implements every register as a D flip-flop; the rs outputs are implemented with muxes from the flip flops, and the D flip-flop value is set to either the current value of the register or to data depending whether write_ctrl is set and rd is equal to the register number.