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Questions and Answers
Which of the following best describes the Asynchronous Data Transfer scheme?
Which of the following best describes the Asynchronous Data Transfer scheme?
- It is used when the I/O device is slower than the microprocessor and its timing is unpredictable (correct)
- It is used when the I/O device is faster than the microprocessor and its timing is unpredictable
- It is used when the timing characteristics of I/O devices are predictable
- It is used when the I/O device is faster than the microprocessor
What does the CPU do in the Asynchronous Data Transfer scheme?
What does the CPU do in the Asynchronous Data Transfer scheme?
- The CPU initiates the I/O device and checks its status
- The CPU transfers data to the I/O device
- The CPU waits until the I/O device is ready to transfer data (correct)
- The CPU predicts the timing characteristics of the I/O device
What are the two types of techniques used in the Asynchronous Data Transfer scheme based on signals before data transfer?
What are the two types of techniques used in the Asynchronous Data Transfer scheme based on signals before data transfer?
- Strobe Control and Handshaking (correct)
- Parallel and Serial
- Synchronous and Asynchronous
- Input and Output
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Study Notes
Asynchronous Data Transfer Scheme
- Asynchronous Data Transfer is a technique where data is transmitted without a clock signal, allowing devices to transmit data at their own pace.
- The CPU's role in this scheme is to initiate the data transfer and then wait for an acknowledgment from the receiving device before transferring more data.
Techniques Used in Asynchronous Data Transfer
- There are two types of techniques used in Asynchronous Data Transfer based on signals before data transfer:
- Synchronous Start-Stop Technique: uses a start bit to indicate the beginning of data transmission and a stop bit to indicate the end of data transmission.
- Asynchronous Character-Oriented Technique: uses a start and stop bit to frame each character, allowing for asynchronous transmission of multiple characters.
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