CISC Vs RISC

• what is an instruction set?

  set of all instructions written in machine code, that can be recognised and executed by a given processing unit / CPU.
• what are the 2 types of instruction sets?

  1) CISC (complex instruction set computer)

  2) RISC (Reduced instruction set computer).
• What is CISC?


  CISC is a processor which is developed with a full (complex) set of instructions aimed at providing the full processor capacity in the most efficient manner.
• what is RISC?


  aim to use simple instructions that will execute within. single machine/clock cycle.
• what are examples of CISC?

  Desktop computers and laptops
• what are the drawbacks of RISC?

  1) The compiler has to do more conversion work

  
  

  2) More ram is needed to store the assembly instructions

  
  

  3) The process is less efficient
• what are examples of RISC?


  Smart TVs, thermostats, smart watches, printers etc
• what is the difference in pipelining between CISC and RISC processors?


  CISC can't make use of pipelining, RISC can.
• what is the difference

  CISC has greater energy consumption than RISC
• what is the difference in hardware required between CISC and RISC?

  CISC has more complex hardware than RISC.

  RiSC has simpler hardware.
• What is the difference of use of RAM between CISC and RISC?


  CISC makes more efficient use of RAM than RISC.
• what is the difference between address modes in RISC and CISC?

  CISC utilises multiple addressing modes whereas RIDC utilises fewer.
• What is the difference in physical size between RISC and CISC?

  CISC is physically larger and has more circuitry than RISC
• what is the difference in price between CISC and RISC?

  CISC requires more silicone to make therefore is more expensive to produce than RISC.