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22 Cards in this Set
- Front
- Back
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What is FDE? |
Fetch ~ Decode ~ Execute |
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What is the fetch sequence? |
- The address is copied to MAR - The control unit located and fetches data and copies it to the MDR - The PC increments to the next instruction to fetch. |
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What is the MAR? |
Memory Address Register |
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What is the MDR? |
Memory Data Register |
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What is the PC in terms of the CPU? |
Program Counter |
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What happens in the decode phase? |
- The CU decodes instructions in the MDR - Copies instructions into the CIR |
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What is the CU? |
Control Unit |
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What happens in the execute phase? |
- Data is loaded into the MDR - Then moved into memory - Data is copied to the ALU for a calculation to be performed. |
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What is the ALU? |
Arithmetic Logic Unit |
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What does the ALU do? |
Carries out calculations and logical decisions required by the program. |
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What does the CU do? |
Decodes instructions and sends out control signals to send and receive instructions. |
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What does the Accumulator do? |
Stores the results of any calculations made by the ALU. |
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What does the PC do? |
Keeps track of memory location for the next instruction. |
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What does the MAR do? |
Stores the location of data to be fetched in memory. |
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What does the MDR do? |
Stores data fetched from memory. |
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What is the FDE system in a CPU called? |
Von Neumann Architecture |
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As well as registers the CPU has very fast memory called _____? |
Cache |
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1) How many levels of cache memory are there? 2) Which level is the most expensive and is located on the CPU? 3) Which level is the least expensive and had the largest capacity? |
1) 3 levels 2) Level 1 3) Level 3 |
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What does clock speed mean? |
The number of instructions that can be completed per second. |
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What do multiple cores do? |
Each core can execute instructions simultaneously. Meaning more instructions could be processed. |
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What is an embedded system? |
An embedded computer is a computer system that has a dedicated function as part of a larger system E.g. a GPS |
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What are the four main system types? |
- Embedded ~ GPS - Dedicated ~ Calculator - Control ~ Washing Machins - General ~ Laptop |
