A single RISC instruction typically performs only a single operation, such as an "add" of registers or a "load" from a memory location into a register. A RISC instruction set normally has a fixed instruction length, whereas a typical CISC instruction set has instructions of widely varying length.
Three Categories of Instructions:
Types of Instruction
In 8085 Instruction set, PUSH rp instruction stores contents of register pair rp by pushing it into two locations above the top of the stack.
The instruction cycle (also known as the fetch–decode–execute cycle, or simply the fetch-execute cycle) is the cycle that the central processing unit (CPU) follows from boot-up until the computer has shut down in order to process instructions.
There are six fundamental phases of the instruction cycle:
Give a scheme to identify the four phases in an instruction (fetch, Decode and operators fetch, execute and interrupt). Solution 3: The four phases can be identified using a code called Instruction Cycle Code (ICC). ICC is a two bit code and designates which part of the phase the CPU is in.
If an instruction is in execution phase and any other instructions can't be in the execution phase. So, atleast 7 clock cycles will be taken. Now, it is given that between two instructions latency or delay should be there based on their operation.
(...) Historically, all early computers used many clock cycles during the execution of even the simplest instruction. ... Since then, CPUs that use techniques such as superscalar execution and multicore computing have reduced this even further. Such CPUs can (on average) use less than 1 cycle per instruction.
How Far We've Come: 40 Years Of Processing Power
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One megahertz is equal to one million cycles per second, while one gigahertz equals one billion cycles per second. This means a 1.
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