Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > In memory-mapped I/O ____________a)The I/O de...
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In memory-mapped I/O ____________
- a)The I/O devices and the memory share the same address space
- b)The I/O devices have a seperate address space
- c)The memory and I/O devices have an associated address space
- d)A part of the memory is specifically set aside for the I/O operation
Correct answer is option 'A'. Can you explain this answer?
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In memory-mapped I/O ____________a)The I/O devices and the memory shar...
Answer: a
Explanation: Its the different modes of accessing the i/o devices.
Explanation: Its the different modes of accessing the i/o devices.
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In memory-mapped I/O ____________a)The I/O devices and the memory shar...
Memory-Mapped I/O
Memory-mapped I/O is a technique used in computer architecture that allows I/O devices to be accessed through the same address space as memory. In this technique, the I/O devices and the memory share the same address space.
Advantages of Memory-Mapped I/O
- Simplifies the interface between the CPU and the I/O devices.
- Reduces the number of instructions required to access I/O devices.
- Allows I/O devices to be treated as memory locations, making it easier to read and write data to them.
- Reduces the complexity of the hardware required to interface with the CPU.
How Memory-Mapped I/O Works?
In memory-mapped I/O, the I/O devices are assigned a range of memory addresses that are used to access them. These memory addresses are mapped to the I/O device's control registers, which are used to configure and control the device.
When the CPU wants to read or write to an I/O device, it simply accesses the corresponding memory address. The memory controller detects that the address corresponds to an I/O device and routes the data to or from the device's control registers.
Disadvantages of Memory-Mapped I/O
- Limited address space: Since the I/O devices share the same address space as memory, the address space available for I/O devices is limited. This can be a problem if there are many I/O devices that need to be accessed.
- Slow I/O access: Memory-mapped I/O can be slower than other techniques because the CPU has to access the memory controller, which then has to route the data to or from the I/O device's control registers.
Conclusion
Memory-mapped I/O is a technique used in computer architecture that allows I/O devices to be accessed through the same address space as memory. It simplifies the interface between the CPU and the I/O devices and reduces the complexity of the hardware required to interface with the CPU. However, it has some disadvantages such as limited address space and slow I/O access.
Memory-mapped I/O is a technique used in computer architecture that allows I/O devices to be accessed through the same address space as memory. In this technique, the I/O devices and the memory share the same address space.
Advantages of Memory-Mapped I/O
- Simplifies the interface between the CPU and the I/O devices.
- Reduces the number of instructions required to access I/O devices.
- Allows I/O devices to be treated as memory locations, making it easier to read and write data to them.
- Reduces the complexity of the hardware required to interface with the CPU.
How Memory-Mapped I/O Works?
In memory-mapped I/O, the I/O devices are assigned a range of memory addresses that are used to access them. These memory addresses are mapped to the I/O device's control registers, which are used to configure and control the device.
When the CPU wants to read or write to an I/O device, it simply accesses the corresponding memory address. The memory controller detects that the address corresponds to an I/O device and routes the data to or from the device's control registers.
Disadvantages of Memory-Mapped I/O
- Limited address space: Since the I/O devices share the same address space as memory, the address space available for I/O devices is limited. This can be a problem if there are many I/O devices that need to be accessed.
- Slow I/O access: Memory-mapped I/O can be slower than other techniques because the CPU has to access the memory controller, which then has to route the data to or from the I/O device's control registers.
Conclusion
Memory-mapped I/O is a technique used in computer architecture that allows I/O devices to be accessed through the same address space as memory. It simplifies the interface between the CPU and the I/O devices and reduces the complexity of the hardware required to interface with the CPU. However, it has some disadvantages such as limited address space and slow I/O access.
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In memory-mapped I/O ____________a)The I/O devices and the memory share the same address spaceb)The I/O devices have a seperate address spacec)The memory and I/O devices have an associated address spaced)A part of the memory is specifically set aside for the I/O operationCorrect answer is option 'A'. Can you explain this answer?
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