Computer Architecture EE/CS 458 Problem Ch8-E1 Revise the example processor design in chapter 5 as follows a) Change the instruction encoding from vertical format for the memory reference instructions and horizontal format for the register reference and IVO instructions to just vertical format for all instructions. Give an opcode for every instruction. b) Add instructions PUSH and POP to the instruction set of the processor in chapter 5. Instruction PUSH stores either AC or E in the system Stack. Instruction POP retrieves the value of AC or E from the system Stack. Give the Execute Cycle for cach one of these two instructions, i.e., list micro-operations and their corresponding control functions for each nstruction c) Suppose that a system Stack is used for saving return addresses to main program in handling subroutine calls and interrupt routines. This is in contrast to the processor in chapter 5, where return addresses are saved in memory for handling subroutine calls and interrupt routines. Do the following: Rewrite the Interrupt Cycle such that the system stack is used for saving return address to the main program. So give micro-operations and control functions for the revised Interrupt Cycle. Also introduce a new instruction called instruction RETI. This instruction retrieves the return address to main program from the system stack and sets PC to that address and also turns on the interrupt by setting IEN to 1. Also give the Execute Cycle for the RETI instruction by listing its micro-operations and the corresponding control functions Similarly revise instruction BSA for handling subroutine calls such that the return address to the mail program is saved in the system stack, not in the memory. Rename instruction BSA as instruction CALL. Give Execute Cycle of the instruction CALL by listing its micro-operations and the corresponding control functions. Introduce a new instruction called instruction RETS. This instruction retrieves the return address to the main program from the system stack and sets PC to that address. Also give the Execute Cycle for the RETS instruction by listing its micro-operations and the corresponding control function:s 1) Submit the rewritten of table 5-6 with the above changes applied. 2) The following program is written using instruction set of the processor in chapter 5 Rewrite this program using the revised instruction as given in part (a) Computer Architecture EE/CS 458 Problem Ch8-E1 Revise the example processor design in chapter 5 as follows a) Change the instruction encoding from vertical format for the memory reference instructions and horizontal format for the register reference and IVO instructions to just vertical format for all instructions. Give an opcode for every instruction. b) Add instructions PUSH and POP to the instruction set of the processor in chapter 5. Instruction PUSH stores either AC or E in the system Stack. Instruction POP retrieves the value of AC or E from the system Stack. Give the Execute Cycle for cach one of these two instructions, i.e., list micro-operations and their corresponding control functions for each nstruction c) Suppose that a system Stack is used for saving return addresses to main program in handling subroutine calls and interrupt routines. This is in contrast to the processor in chapter 5, where return addresses are saved in memory for handling subroutine calls and interrupt routines. Do the following: Rewrite the Interrupt Cycle such that the system stack is used for saving return address to the main program. So give micro-operations and control functions for the revised Interrupt Cycle. Also introduce a new instruction called instruction RETI. This instruction retrieves the return address to main program from the system stack and sets PC to that address and also turns on the interrupt by setting IEN to 1. Also give the Execute Cycle for the RETI instruction by listing its micro-operations and the corresponding control functions Similarly revise instruction BSA for handling subroutine calls such that the return address to the mail program is saved in the system stack, not in the memory. Rename instruction BSA as instruction CALL. Give Execute Cycle of the instruction CALL by listing its micro-operations and the corresponding control functions. Introduce a new instruction called instruction RETS. This instruction retrieves the return address to the main program from the system stack and sets PC to that address. Also give the Execute Cycle for the RETS instruction by listing its micro-operations and the corresponding control function:s 1) Submit the rewritten of table 5-6 with the above changes applied. 2) The following program is written using instruction set of the processor in chapter 5 Rewrite this program using the revised instruction as given in part (a)