processor - Implementing jump register control to single-cycle MIPS -

I am trying to implement the junior (jump register) instruction for a single-cycle MIPS processor. In the following image, I have drawn a simple mix that allows to choose between the normal series PC or Direction (JR) address.

How can I know that the instructions are JR To set Mux selection to '1'? I have already jumped and jump_and_link (although the image does not show up, because I do not have a project in my hand right now), and to control them, I just check that the OP code is 10 (jump) or Set the music cell for 11 (burn) in main control and then '1'. But I think I can not do this with JR, because the instructions layout is different.

A JR direction of opcode instructions [31:26] == 0 (special) and instructions [5: 0] == 0x08 (JR). You need to look at both of these situations to decide that this is a JR instruction on your drawing with the control block one of the instructions Additional input is required [5: 0]. Instructions in the field rs [25:21] selects the source register for this instruction. A PC is required to assign to rs when a JR instruction is executed.