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The instruction pipeline of a RISC processor has the following stages: Instruction Fetch (IF), Instruction Decode (ID), Operand Fetch (OF), Perform Operation (PO) and Writeback (WB), The IF, ID, OF and WB stages take 1 clock cycle each for every instruction. Consider a sequence of 100 instructions. In the PO stage, 40 instructions take 3 clock cycles each, 35 instructions take 2 clock cycles each, and the remaining 25 instructions take 1 clock cycle each. Assume that there are no data hazards and no control hazards. The number of clock cycles required for completion of execution of the sequence of instruction is ______ . 
Note - This was Numerical Type question.
  • a)
    219
  • b)
    104
  • c)
    115
  • d)
    220
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The instruction pipeline of a RISC processor has the following stages:...
Given, total number of instructions (n) = 100 Number of stages (k) = 5 Since, if n instructions take c cycle, so (c-1) stalls will occur for these instructions. Therefore, the number of clock cycles required = Total number of cycles required in general case + Extra cycles required (here, in PO stage) = (n + k - 1) + Extra cycles = (100 + 5 -1) + 40*(3-1)+35*(2-1)+20*(1-1) = (100 + 4) + 40*2+35*1+20*0 = 104 + 115 = 219 cycles So, option (A) is correct.
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Most Upvoted Answer
The instruction pipeline of a RISC processor has the following stages:...
Given:
- Instruction pipeline stages: IF, ID, OF, PO, WB
- Each stage takes 1 clock cycle for every instruction
- Sequence of 100 instructions
- PO stage: 40 instructions take 3 clock cycles, 35 instructions take 2 clock cycles, 25 instructions take 1 clock cycle
- No data hazards or control hazards

To find: Number of clock cycles required for completion of execution of the sequence of instructions

Approach:
- Calculate the number of clock cycles required for each instruction in the PO stage
- Calculate the total number of clock cycles required for all instructions in the PO stage
- Calculate the total number of clock cycles required for all instructions in all stages
- Add 4 clock cycles (IF, ID, OF, WB) for each instruction
- Add 1 more clock cycle as there are no hazards
- Add all the clock cycles to get the final answer

Solution:
- Clock cycles required for each instruction in PO stage:
- 40 instructions * 3 cycles = 120 cycles
- 35 instructions * 2 cycles = 70 cycles
- 25 instructions * 1 cycle = 25 cycles
- Total = 215 cycles
- Clock cycles required for all instructions in all stages:
- IF stage = 100 cycles
- ID stage = 100 cycles
- OF stage = 100 cycles
- PO stage = 215 cycles
- WB stage = 100 cycles
- Total = 615 cycles
- Additional clock cycles for no hazards = 1 cycle
- Final answer = Total clock cycles + Additional clock cycles = 615 + 1 = 616 cycles
- As each instruction takes 5 clock cycles, total number of instructions executed = 100 * 5 = 500
- Therefore, the number of clock cycles required for completion of execution of the sequence of instructions = 616

Therefore, the correct answer is option A (219).
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The instruction pipeline of a RISC processor has the following stages: Instruction Fetch (IF), Instruction Decode (ID), Operand Fetch (OF), Perform Operation (PO) and Writeback (WB), The IF, ID, OF and WB stages take 1 clock cycle each for every instruction. Consider a sequence of 100 instructions. In the PO stage, 40 instructions take 3 clock cycles each, 35 instructions take 2 clock cycles each, and the remaining 25 instructions take 1 clock cycle each. Assume that there are no data hazards and no control hazards. The number of clock cycles required for completion of execution of the sequence of instruction is ______ .Note -This was Numerical Type question.a)219b)104c)115d)220Correct answer is option 'A'. Can you explain this answer?
Question Description
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