RISC

What is RISC

In the mid 1970's advances in semiconductor technology began to reduce the difference in speed between main memory and processor chips.As memory speed increased,and high level languages replaced assembly language,the major reasons for CISC began to disappear,and computer designers began to look at ways computer performance could be optimized beyond just making faster hardware.One of their key realizations was that a sequence of simple instructions produces the same results as a sequence of complex instructions,but can be implemented with a simpler and faster hardware design.Reduced instruction set computer(RISC) is the result.

Characteristics of RISC

• Simple Instruction Set:In RISC machine,the instruction set contains simple basic instructions,from which more complex instructions can be composed
• Same length instructions:Each instruction is the same length so that it may be fetched in a single operation.
• 1 machine-cycle instructions