MIPS Datapath with control

[bStiffler582]

I don't fully understand how to modify the datapaths/control signals to account for instructions. I have to make the single-cycle datapath able to do the instructions:
jr
lui
addi
bne

I've been starting at this thing for an hour or so and haven't made much progress. With the jr instruction, I realize that the rs register contains the jump address. From there I don't really have any idea on where to start. Once I see a couple of these instructions I can probably figure out the rest.

I've attached a picture of the datapath that needs the modding.

[bStiffler582]

Edit: For lui, I've realized I will need to shift left 16 after the sign extend, to get the bits in the upper 16. This is basicaly my only progress.

[Salem]

Look at the "branch" bit coming out of the control bubble, and how that affects the MUX in the top right corner of the diagram.

[LibraTaimur]

if we want to branch to instructution whose address comes first and then comes the instruction which is in pc... how branch will be done??? will it right shift..???