# CS501 Masters Series: Lecture 19 - Davis Square Microarchitecture and Pipelining

ConciseArithmetic6717
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## 4 Questions

### What are the five stages of pipelining discussed in the lesson?

Instruction Fetch, Decode, Execute, Memory Access, and Write Back

### What is the role of ir3 (program counter) in loading instructions?

It keeps track of the memory addresses of the instructions being executed

### What is the function of ar (arithmetic register) in the pipeline?

It stores the result of arithmetic operations performed in the Execute stage

Repetition

## Study Notes

• The text is about a video lesson in a course called "cs501 Masters Series" by MIT.
• The lesson is covering lecture number 19, where two instructors will be discussed.
• The previous instructor covered five-line disks in a mid-term, so the current instructors will be reviewing that and more.
• In the first part of the lesson, they will discuss pipelining with the Davis Square Microarchitecture.
• Pipelining consists of five stages: Instruction Fetch (IF), Decode (De), Execute (Ex), Memory Access (Mem), and Write Back (WB).
• The instructors will examine the effects of ir2 (instruction register) on the pipeline and the role of ir3 (program counter) in loading instructions.
• They will also discuss the function of ar (arithmetic register) and memory access functions in the pipeline.
• The instructors will then cover branch instructions and their effects on the pipeline.
• Later, they will discuss the concept of repetition in the pipeline and how it impacts memory access.
• The lesson includes a diagram of the pipeline, which shows the flow of instructions and data through the different stages.
• The instructors will also discuss the concept of constant registers and their role in the pipeline.
• They will explain how constants are loaded into the pipeline and how they affect memory access.
• The lesson covers various aspects of the pipeline, including interrupt handling, memory hierarchy, and cache coherence.
• The instructors will emphasize the importance of understanding the pipeline and its impact on performance.
• They will provide examples and use case scenarios to help illustrate the concepts.
• The lesson is intended to provide a comprehensive understanding of the pipeline concept and its applications in computer architecture.

Explore the detailed discussion on various aspects of pipelining, including the effects of different registers, branch instructions, memory access, constant registers, interrupt handling, memory hierarchy, and cache coherence. Gain a comprehensive understanding of the Davis Square Microarchitecture and its application in computer architecture.

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