📗 -> 03/18/25: ECS154A-L26
🎤 Vocab
❗ Unit and Larger Context
Doing a catch up lecture
✒️ -> Scratch Notes
Transclude of ECS154A-L26-2025-03-18-19.54.54.excalidraw
FF overhead terms:
- Propagation time: Time it takes when you give it the clock for the thing to come out
- Setup time: The amount of time required for the input to a Flip-Flop to be stable before a clock edge
Pipeline overhead:
- A transfer from pipeline stage to pipeline stage
- A function of the hardware you’re using.
- They limit how much you can pipeline because they add extra time each step you add
Balanced pipeline:
- Worst case paths have to be approximately equal
- When balancing a pipeline, usually a better bet to try and combine steps than to split
- Not always, no hard and fast rule, but generally
Bypass/Forwarding
- Having external hardware detect that a value will be needed, and directly passing the value
- However, some instructions have data later (like lw), and even forwarding needs bubbles
You can do a NOP by:
- Deny the ability to write until its in the correct stage. Then, its like nothing happened.
Basic Block:
- Sequence of instructions with a single entry and a single exit
- Cannot schedule code mixing between basic blocks.
- These are the unit used to execute code scheduling a lot of the time, move instructions around within a basic block.
🧪 -> Refresh the Info
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🔗 -> Links
Resources
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