Since I have the PDF open (Page 23 of the 2023 revision), let’s look at the specific equation that changed how I benchmark code:
"CPU Execution Time = Instruction Count × Cycles per Instruction (CPI) × Clock Cycle Time"
This isn't just a formula; it is the Law of Physics for Software. modern computer architecture rafiquzzaman pdf 23
While other textbooks give you this equation and move on, Rafiquzzaman does something brilliant on this page. He breaks down the interrupt penalty within a real-time system.
He argues that modern architects don't just care about IPC (Instructions Per Clock) ; they care about Determinism. Page 23 contains a table comparing: Since I have the PDF open (Page 23
You would likely encounter a table listing:
| Register | Symbol | Purpose | |----------|--------|---------| | Program Counter | PC | Holds address of next instruction | | Instruction Register | IR | Holds current instruction | | Accumulator | ACC | Stores ALU results | | Memory Address Register | MAR | Address to read/write | | Memory Data Register | MDR | Data to/from memory | "CPU Execution Time = Instruction Count × Cycles
Page 23 often marks the transition from historical background to concrete architectural details. You might find review questions or exercises, such as:
“Explain the difference between the MAR and MDR. Why are both needed?”