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In an instruction execution pipeline, the earliest that the instruction TLB and data TLB can be accessed are 
  • a)
    Memory stage and execute stage respectively
  • b)
    Fetch stage and fetch stage respectively
  • c)
    Memory stage and memory stage repectively
  • d)
    Fetch stage and memory stage respectively
Correct answer is option 'D'. Can you explain this answer?
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In an instruction execution pipeline, the earliest that the instructio...
Concept:
Instruction pipelining partitions the execution process into multiple independent steps capable of occurring in parallel. Instructions traverse these partitions one stage at a time. Once an instruction progresses to the next step, the next instruction can take its place in the pipeline, and so on.
RISC processor has 5 stage instruction pipeline to execute all the instructions in the RISC instruction set.
  • Instruction Fetch: In this stage, the CPU reads instructions from the address in the memory whose value is present in the program counter.
  • Instruction Decode: In this stage, instruction is decoded and the register file is accessed to get the values from the registers used in the instruction.
  • Instruction Execute: In this stage, ALU operations are performed.
  • Memory Access: In this stage, memory operands are read and written from/to the memory that is present in the instruction.
  • Write Back: In this stage, the computed/fetched value is written back to the register present in the instructions.
A processor that supports paging (which typically includes a mechanism for excluding execute permission even if not separately from reading permission) will access a TLB as part of instruction fetch. A translation lookaside data (TLB) is a memory cache that is used to reduce the time taken to access a user's memory location. The earliest that the instruction TLB and data TLB can be accessed is the fetch stage and memory stage respectively.
Hence the correct answer is the Fetch stage and memory stage respectively.
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In an instruction execution pipeline, the earliest that the instructio...
Explanation:

Instruction Execution Pipeline:
- In an instruction execution pipeline, tasks are divided into stages to improve performance by allowing multiple instructions to be processed simultaneously.

TLB Access in Pipeline:
- TLB (Translation Lookaside Buffer) is a cache that stores mappings between virtual addresses and physical addresses in a memory management system.

Earliest Access Points:
- The earliest that the instruction TLB and data TLB can be accessed are in the fetch stage and memory stage respectively.

Fetch Stage:
- In the fetch stage, the processor fetches the next instruction from memory based on the program counter. This is where the instruction TLB can be accessed to translate virtual addresses to physical addresses.

Memory Stage:
- In the memory stage, data access operations are performed, such as loading data from memory or storing data back to memory. This is where the data TLB can be accessed to translate virtual addresses to physical addresses for data access.

Conclusion:
- Therefore, in an instruction execution pipeline, the instruction TLB can be accessed in the fetch stage, while the data TLB can be accessed in the memory stage, making these the earliest access points for their respective TLBs.
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In an instruction execution pipeline, the earliest that the instruction TLB and data TLB can be accessed area)Memory stage and execute stage respectivelyb)Fetch stage and fetch stage respectivelyc)Memory stage and memory stage repectivelyd)Fetch stage and memory stage respectivelyCorrect answer is option 'D'. Can you explain this answer?
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