$2-$ Design the control unit using the microprogram control method$($microC$)$ for a MIPS Multicycle datapath that can handle the following microinstructions.

$$ memory$-$reference instructions: lw$,$ sw

$$ arithmetic$-$logical instructions: add, addu, sub, subu, and, or$,$ xor, nor, slt$,$ sltu

$$ arithmetic$-$logical immediate instructions: addi, addiu, andi, ori, xori, slti, sltiu

$$ control flow instructions: beq, j