Control

• Part of the processor
• read instructions from memory
  • instructions defined by the Instruction Set Architecture
• issue signals to control the information flow between the datapath components and what operations t hey perform
• tells the datapath, memory, and I/O devices what to do instructions of the program

Control Signals

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ALU Control

• Takes the instruction and finds what OPCode to feed into the ALU to do the instruction

With Pipelining

• Pipelining
• 
• 
• In the wild, chips use distributed controllers but it is simpler to just think of a single one

Digital Logic Addition

• Modeled using Finite State Automata
• Implementation Options
  • Hard-wired control
    • Realized as combinational logic
    • Advantage: Fast
    • Drawback: Not flexible
  • Microprogramming
    • Behavior can be changed through memory override
    • Advantage: Flexible
    • Drawback: Slow