<p><strong>Instruction Format:</strong></p><p>The following instructions are to be implemented. Theinstruction format: 4-bit opcode; 4-bit register field (orimmediate).</p><p>Opcode</p><p>Rd</p><p>Rs</p><p>Rt / Imm</p><p>sub Rd, Rs,Rt opcode 0001,performs Reg[Rd] <- Reg[Rs] - Reg[Rt]</p><p>Or Rd,