Building Instruction set Architecture(ISA)

n this assignment, you will create your own architecture or ISA (Instruction Set Architecture). You have some freedom to decide how your ISA will finally look like, subject to the constraints listed below: 1. The architecture must be GPR architecture (General Purpose Register-based). 2. Your instruction size (total instruction width) should be in the vicinity of 16 bits (You may vary the width anywhere from 16 to 24 bits, if you choose to have variable encoding.) 3. It is a traditional stored-program computer, i.e. both instructions and data are accessed from memory. Your computer cannot be OISC/URISC (One Instruction Set Computer/Ultimate RISC) or ZISC (Zero Instruction Set Computer) etc. 4. The word-size for data is 1 byte 5. Memory is byte-addressable (i.e., every byte in the memory has a unique address) For every decision that you make, you need to provide a justification or motivating reason. You should consider several factors and their potential effects while making decisions. These include, but are not limited to the following: • Total instruction width: fixed-width or variable-width? • How many types of operations do you want to support? (You have the freedom to designate a set of opcode patterns as ‘unused’ or ‘reserved’). • How are the instructions encoded? How many fields are possible within the instruction? Do the different fields have fixed-width or variable width? • What are the different types of instructions that you want to support (for example, loads, stores, ALU integer, ALU floating point, jumps, branches etc.)