From Higher Computing Science
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- The data bus sends data from the processor to memory and back again. The data bus only works in conjunction with the address bus (it must have a memory address to read from, or write to)
- The data bus is bidirectional – data can travel from memory to processor or processor to memory.
- The size of the data bus determines how many bits the processor can process in one operation. This is called the word size.
- Increasing the size of the data bus improves system performance, as more bits can be transferred each clock cycle.