Outline?

Rambling Man

Adder:

• Extremely easy to make it.
• Can do subtraction (add negative)
• Can do multiplication (add multiple times)
• Can do division (subtracting multiple times)

Flip-Flop:

• Simplest unit of memory cell

Pipelining:

• Situation: Reading instruction from memory to CPU, decoding it, executing it, and writing back to register
  1. Fetch
  2. Decode
  3. Execute
  4. Write-Back
• Suppose it takes a minute to do every action, then two instructions will take 8 minutes.
• Solutions to this are pipelining and superscaling.
  • What are they? I don’t know.

Caches:

• New computers (>10 years) have 3 layers of cache.
  • I don’t know what this means.

???:

• SISD: Single Instruction Single Data
• SIMD: Single Instruction Multiple Data
• MIMD: Multiple Instruction Multiple Data

Synchronous: Whole is system is controlled with a ??? clock.

Polling v.s. Interrupt:

1. Interrupt: Mid-lecture, a student asks a question, and the professor interrupts the lecture to answer.
   • Better the polling 99% of the time
2. Polling: The professor asks every student “do you have a question?”.

Faulty Devices v.s. Interrupt/Polling:

• A broken device that doesn’t send an interrupt will never be found.
• A broken device that doesn’t respond to polling will be found

Tuesday: Teach Thursday: Teach and Discuss

• Divide into groups of four.