Please design the ISA and give the solution of question [A*B-(C*D)] by your design. (1) Please design R-M type instructi

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Please design the ISA and give the solution of question
[A*B-(C*D)] by your design.
(1) Please design R-M type instructions to meet 20 instructions,
R refers to the register (R0-R3), M refers to the memory address
(11 bits long);
(2) Support three different addressing modes: direct, indirect
and register;
(3) The instruction set does not support multiplication and
division;
(4) Implement A*B-(C+D) with the newly designed instruction
set.