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Which priority encoder is used in MC68000?
- a)4-to-2 priority encoder
- b)LS148 7-to-3
- c)2-to-4 priority encoder
- d)LS148 3-to-7
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which priority encoder is used in MC68000?a)4-to-2 priority encoderb)L...
Explanation: The LS148 7-to-3 priority encoder is used in MC68000. This converts the seven external pins into a three-bit binary code.
Most Upvoted Answer
Which priority encoder is used in MC68000?a)4-to-2 priority encoderb)L...
Understanding the MC68000 Architecture
The MC68000 is a 16/32-bit microprocessor developed by Motorola, renowned for its powerful architecture and versatility. One of its key features is the type of priority encoder it utilizes.
Priority Encoder in MC68000
The correct answer to the question regarding the priority encoder used in the MC68000 is option 'B': LS148 7-to-3 priority encoder. Here’s why:
Functionality of the LS148
- The LS148 is a 7-to-3 priority encoder capable of handling multiple inputs.
- It encodes the highest-priority active input into a binary output.
- This is particularly useful in interrupt handling, where the processor needs to respond to multiple interrupt requests efficiently.
Importance of Priority Encoding
- In systems with multiple interrupt lines, priority encoders determine which interrupt to service first.
- The LS148 manages seven input lines, allowing for a broader range of interrupts, ensuring that the most critical signals are addressed swiftly.
Comparative Analysis with Other Options
- 4-to-2 Encoder (Option A): Limited to fewer inputs, not suitable for the MC68000's needs.
- 2-to-4 Encoder (Option C): Also insufficient for handling multiple interrupts.
- 3-to-7 Encoder (Option D): Not compatible with the structure of the MC68000, as it does not match the required input-output relationship.
Conclusion
In summary, the LS148 7-to-3 priority encoder is integral to the MC68000's design, facilitating efficient interrupt management and enhancing the overall performance of the microprocessor.
The MC68000 is a 16/32-bit microprocessor developed by Motorola, renowned for its powerful architecture and versatility. One of its key features is the type of priority encoder it utilizes.
Priority Encoder in MC68000
The correct answer to the question regarding the priority encoder used in the MC68000 is option 'B': LS148 7-to-3 priority encoder. Here’s why:
Functionality of the LS148
- The LS148 is a 7-to-3 priority encoder capable of handling multiple inputs.
- It encodes the highest-priority active input into a binary output.
- This is particularly useful in interrupt handling, where the processor needs to respond to multiple interrupt requests efficiently.
Importance of Priority Encoding
- In systems with multiple interrupt lines, priority encoders determine which interrupt to service first.
- The LS148 manages seven input lines, allowing for a broader range of interrupts, ensuring that the most critical signals are addressed swiftly.
Comparative Analysis with Other Options
- 4-to-2 Encoder (Option A): Limited to fewer inputs, not suitable for the MC68000's needs.
- 2-to-4 Encoder (Option C): Also insufficient for handling multiple interrupts.
- 3-to-7 Encoder (Option D): Not compatible with the structure of the MC68000, as it does not match the required input-output relationship.
Conclusion
In summary, the LS148 7-to-3 priority encoder is integral to the MC68000's design, facilitating efficient interrupt management and enhancing the overall performance of the microprocessor.
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