INTERVIEW QUESTIONS COMPUTER HARDWARE 8085 DETAILS

Question: What is machine cycle,instruction cycle and T-state?

Answer: Machine Cycle:The necessary steps to a fetch,a read or a write operation constitute a Machine cycle.

Instruction Cycle:The necessary steps that a CPU carries out to fetch an instruction and necessary data from the memory,and to execute it constitute an Instruction Cycle.

T-state:One sub-division of an operation performed in one clock cycle is called a T-state.

Machine Cycle:The necessary steps to a fetch,a read or a write operation constitute a Machine cycle.

Instruction Cycle:The necessary steps that a CPU carries out to fetch an instruction and necessary data from the memory,and to execute it constitute an Instruction Cycle.

T-state:One sub-division of an operation performed in one clock cycle is called a T-state. Source: CoolInterview.com

Machine cycle- Machine cycle is defined as the time required to complete the one operation.It includes of 3-6 T-states.
Instruction cycle- It is defined as the time required to complete the execution of an instruction.8085 instruction cycle consist of 1-6 machine cycle.
T-state- It is defined as subdivision of d operation performed in One clock period. Source: CoolInterview.com

machine cycle:the entire operation of fetching instruction ,executing it and reading and writing instruction
instruction cycle:the sum of fetching cycle and executing cycle of an instruction is called instruction cycle
t state:one subdivison of operation performed by cpu in one clock cycle Source: CoolInterview.com

Machine cycle is collection of t-states which perform to execute per instruction. Source: CoolInterview.com

machine cycle_ ::
the total work in fetching,read and write operation is machine cycle.

instruction cycle-:: total time taken to completely execute any instruction.

T-state-:: work done in one clock pulse
Source: CoolInterview.com

;INSTRUCTION CYCLE= AN INSTRUCTION CYCLE IS DEFINED AS THE TIME REQUIRED TO COMPLETE THE EXECUTION OF AN INSTRUCTION .BASICALLY THE 8085 USES ONE TO FIVE MACHINE CYCLE

;MACHINE CYCLE= MACHINE CYCLE IS DEFINED AS THE TIME REQUIRED TO COMPLETE ANY OPERATION OF ACESSING EITHER MEMORY OR I/O WHICH IS THE SUBPARTS OF AN THE INSTRUCTION. IN 8085 THE MACHINE CYCLE MAY CONSIST THE THREE TO SIX T STATES

;T-STATES= THE SUBDIVISION OF AN OPERATION WHICH IS PERFORMED IN ONE CLOCK PERIOD IS CALLED AS T-STATES Source: CoolInterview.com

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