1. 240-334 By Wannarat 241-440 Computer System Design Lecture 8 Wannarat Suntiamorntut

2. 240-334 By Wannarat PIPELINE Part II

3. 240-334 By Wannarat Pipeline Hazard Again

4. 240-334 By Wannarat Data Hazard Avoid some “by design” - EliminateWAR - EliminateWAW

5. 240-334 By Wannarat Resolve RAW by forwarding

6. 240-334 By Wannarat About memory Operations If instructions are initiated in order and operations always occur in the same stage, there can be no hazards between memory operations.

7. 240-334 By Wannarat Interrupt & Pipeline External Interrupts : - allow pipeline to drain - load PC with interrupt address Internal Interrupts : - Force trap instruction into IF - disable write still trap hits WB - must save multiple PCs or PC + state

8. 240-334 By Wannarat Exception Hadling

9. 240-334 By Wannarat Exception Problem How to stop pipeline? Restart? Who caused the interrupt? Solution 1 : interrupt Vector Solution 2 : interrupt ASAP restart everything incomplete

10. 240-334 By Wannarat Resolution : Freeze above & Bubble Below

11. 240-334 By Wannarat Issued in Pipeline Design

12. 240-334 By Wannarat Multiple Pipes

13. 240-334 By Wannarat Next on Lecture 9