Question

Match List - I with List - II. 

List - I		List - II
A.	Machine cycle	I.	Time required to complete one operation (Fetch/read/write)
B.	T-state	II.	One subdivision of a machine cycle
C.	Instruction cycle	III.	Time required to complete one instruction
D.	Opcode fetch	IV.	Machine cycle to get instruction opcode from memory

Choose the correct answer from the options given below:

• A. A-II, B-III, C-IV, D-I
• B. A-III, B-IV, C-I, D-II
• C. A-I, B-II, C-III, D-IV
• D. A-I, B-II, C-IV, D-III

Hint:

Hierarchy: Instruction Cycle $\to$ Machine Cycle $\to$ T-state. An instruction is made of cycles, and a cycle is made of T-states!

Answer 1

The Correct Option is C

This matching defines the timing hierarchy in microprocessor operations (specifically 8085). 1. Machine Cycle (A-I): The time required to complete one basic operation like accessing memory (Read/Write) or an I/O device. 2. T-state (B-II): The smallest unit of time in a microprocessor, corresponding to one clock period. It is a subdivision of a machine cycle. 3. Instruction Cycle (C-III): The total time required to fetch and execute a complete instruction. It consists of one or more machine cycles. 4. Opcode Fetch (D-IV): A specific type of machine cycle where the microprocessor retrieves the first byte (the opcode) of an instruction from memory.