17166902
Description
Flashcards by Oliver Bairstow, updated more than 1 year ago
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Created by Oliver Bairstow
over 5 years ago
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| Question | Answer |
| What is the ALU and what does it do? | The Arithmetic and Logic Unit is where arithmetic and logical operations are performed. The results are stored in the accumulator. |
| What is the CU and what does it do? | The Control Unit controls how data moves around parts of the CPU and how it moves between the CPU and memory. Instructions are decoded in the CU. |
| What is the PC and what does it do? | The Program Counter always contains the address of the next instruction to be executed. It gets incremented to point to the next instruction. |
| What is the ACC and what does it do? | The Accumulator stores the results of calculations made by the ALU. |
| What is the MDR and what does it do? | The Memory Data Register stores the data that has been fetched from or stored in memory. |
| What is the CIR and what does it do? | The Current Instruction Register is where fetched instructions are copied to for execution. |
| What are address buses and what do they do? | They send information about where data needs to go by sending an address to the memory. The address bus only sends data in one direction. |
| What are control buses and what do they do? | Sends signals from the CU this goes both ways. |
| How is pipelining used in a processor to improve efficiency? | Several instructions are partially executed at the same time. |
| What is RAM? | Random access memory. Access to RAM is quicker than a storage device. Programs and data being run by a computer are temporarily stored here. RAM is volatile. |
| What is ROM? | Read only memory. Can be read from but not written to. A common use is for storing the program to boot up the computer. ROM is non-volatile. |
| What is a primary key? | It is a unique identifier for a table or record. |
| What is a foreign key? | A primary key of one table might be linked to another table, where it appears as a foreign key. |
| What is a secondary key? | An additional key which can be used to search for a record in a database. They don't have to be unique. |
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