Building CPU in CPUsim

Design an instruction set for a [login to view URL] 8-bit instructions set for a CPU which operates on 12-bit signed numbers. Your computer system will consist of CPU, BUS, and MAIN MEMORY. You are asked to design a computer system which will be able to process: -Arithmetic operations: Addition, Subtraction, Multiplication (on data which might be on registers or main memory) -Logical operations: You will need to decide which logical operations you will need. -Branch operations: You will need to decide which branch operations you will need. -And any other need operations. Make and state any necessary assumptions and explain all the design decisions. In your report, include following points: -width of instructions (will be given in LMS for each group) -Word size -Bus width -List of registers in CPU (user-accessible and inaccessible) and their sizes -Instruction formats: structure of instruction, explanation on why you have selected certain instructions and which registers can be used with that instruction. -Binary code for each opcode. -Which addressing modes will be supported -Which flags will be included -A sample program You are free to design your instructions, computer systems as you want, however, you are required to explain each detail.