Topic 7 Flashcards
(39 cards)
What is a backing store?
A non-volatile storage device
What does a power supply do?
Converts alternating current to low-voltage direct voltage
Name four tasks the processor is responsible for?
Sorting and searching data
Performing calculations
Logical decision making
Control of input, output and storage devices
What is the bus system is composed of?
The bus system is composed of the communication links which connect the various parts of the computer
What are the 3 buses?
Address bus
Data bus
Control bus
Draw the bus diagram
xxx
What does the main memory do?
Main memory stores program instructions and data that are processed by the processor
What does the address bus do?
The address bus specifies a physical address in main memory and the value that is to be read or written into that address is communicated via the data bus
What does the control bus do?
the control bus manages data processing; for example, sends a signal to either write from the data bus to a memory address or a signal to read data from a memory address
Input and output - ______ _______ received from the _______ include input (read) or _____ (_____) requests. These control signals are the used to connect a ______ bus to specific I/O devices.
PROCESSOR WRITE CONTROL SIGNALS OUTPUT SYSTEM
Input and output - control signals received from the processor include input (read) or output (write) requests. These control signals are the used to connect a system bus to specific I/O devices.
What is Von Neumann’s architecture?
Data and instructions are both stored in the main memory
Draw the Von Neumann architecture
What is Harvard architecture?
Draw Harvard architecture
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What is addressable memory
What is addressable memory
Why is addressable memory used?
the processor needs to be able to locate memory locations so each location is given a code
How does the processor locate a memory location?
- The processor writes the code into the address bus
- The processor sends a request to the control bus with instructions to read or write to the memory location
- The data that is being read from or written to will be transferred via the data bus
What is the stored program concept?
Data and instructions are both stored in the main memory
What is Harvard architecture?
data and instructions are stored separately
What does the ALU do?
Performs mathematical and logical operations
What does the control unit do?
Fetches instructions, decodes them, and executes
What does the clock do?
Synchronises computer operations
What does the register do?
Used to hold instructions and data temporarily
What are general purpose registers used for?
Used to hold instructions and data temporarily
What does the ACC register do?
Used as fast temporary storage by the ALU
