19376602
Description
Mind Map by Emma Worman, updated more than 1 year ago
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Created by Emma Worman
over 4 years ago
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Systems Architecture
- Von Nuemann
- Uses a single processor
- Uses 1 memory for both instructions and data
- Executes programs following the fetch, decode, execute cycle
- Based off the stored- program computer concept, where
instructions data and program data are stored in the same
memory
- This concept is still used today
- Uses a single processor
- Control Unit (CU)
- It lets the computers logic unit, memory, as well
as both input and output devices Know how to
respond to instructions.
- Coordinates the CPU
- It lets the computers logic unit, memory, as well
as both input and output devices Know how to
respond to instructions.
- Arithmetic Logic Unit (ALU)
- Works out all the calculations
- Modern CPUs contain very powerful ALUs
- Works out all the calculations
- Registers
- Current Instruction Register (CIR)
- Holds the
instruction the
has just been
fetched
- Holds the
instruction the
has just been
fetched
- Memory Address Register (MAR)
- Holds the address of data that
needs to be accessed
- Holds the address of data that
needs to be accessed
- Memory Data Register (MDR)
- Holds the data for the next instruction to be
decoded
- Holds the data for the next instruction to be
decoded
- Accumalater (ACC)
- Holds all the ALU data
- Holds all the ALU data
- Current Instruction Register (CIR)
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