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Control Unit (Functions (Coordinates the sequence of data movements,…
Control Unit
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How it works?
- Receive input information and convert into control signals and send to central processor
- Processor tells the attached hardware what operations to perform
Control unit performs are dependent on the type of CPU because the architecture of CPU varies from manufacturer to manufacturer
Destinations
Data path
- controls data
- each path has a gate
- control signal opens the gate to let data pass
ALU
- controls the operations of ALU
- activate various logic devices and gates
System bus
- control unit sends signals out onto the control lines
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Control Signals
Clock
- one micro-operations per clock cyxle
Instruction register
- op-code for current instruction
- which micro-instructions are performed
Flags
- State of CPU
- Result of precious operations
From control bus
- interrupts
- acknowledgements
Within CPU
- Data movement
- Activate specificities functions
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