Design the instruction formats for the following instruction set using an expanding opcode. The size of all instructions is 32 bits, all register numbers are 4 bits, memory addresses are 20 bits, and the displacement field is 16 bits. For each category of instructions, show the instruction format, what fields it has, and the number of bits in each field. Also show the range of values for the opcode for each instruction category. • 15 instructions with two register numbers and one memory address
• 15 instructions with one register number and one memory address
• 60 instructions with one register number and one displacement
• 15 instructions with one displacement