I-type instructions has a different opcodes

[Billkyriaf]

In the \subsection{I Type} the first graph shows the opcode as 0000011, which is the opcode for the memory instructions. The I-Type ALU instructions have opcode 0010011, the jalr instruction has opcode 1100111 etc. In the subsection, there is no clarification for the different opcodes. I apologize if this matter is covered elsewhere. Finally, if it is not covered I suspect the same problem may occur in all the types of instructions covered in the 5.2 subsection.

[johnwinans]

I am surprised that this has not come up before. I must have copied & pasted something without finishing the necessary updates.

[johnwinans]

Maybe I should just put all zeroes or Xs in the opcode field since that is not really the relevant part of the discussion at that point?

[Billkyriaf]

All Xs would be good I think, to show that it is just a placeholder. But I believe it would be very useful to include the opcode, func3, and func7 next to each instruction. Chapter 5 is a great reference and it would be great if it had all the information in one place.