Book Computer Organization Carl Hamacher 6th Edition 525 M

Book: Computer Organization - Carl Hamacher (6th Edition)

5.25 [M] Give the sequence of steps needed to fetch and execute the instruction
Load R3, (R5)+
on the processor of Figure 5.24. Assume 32-bit operands.

Solution

sequence steps to fetch and execute a single instructions

step 1:Fetch assembly instruction

step 2:Decode instructions and fetch operands

step 3:perform operations from arithmatic and logic unit

step 4:access the memory

step 5:write back the final value or result to the register

step 6:uppdate your computer telling it that the cahange has occured

given problem solution

note:

PC:program counter

1 Memory address <–[PC], Read memory, Wait for MFC , IR <–Memory data, PC <–[PC] + 4
2 Decode instruction
3 Memory address <–[PC], Read memory, Wait for MFC, Tempmem1<– Memory data,
PC<– [PC] + 4//increment program counter by 4 positions
4 Tempmem2 <–[Tempmem1] = [R3]
5 Memory address <–[Tempmem2], Read memory and wait for MFC, Tempmem<–Memory data
6 Tempmem1 <–[Tempmem1] + [R5]
7 Memory address<– [Tempmem2], Memory data <–[Tempmem1],Write to memory and wait for MFC