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Questions and Answers
What is the primary function of the strobe control in asynchronous data transfer?
What is the primary function of the strobe control in asynchronous data transfer?
Which unit initiates the data transfer in source-initiated strobe control?
Which unit initiates the data transfer in source-initiated strobe control?
What is the disadvantage of the strobe control method?
What is the disadvantage of the strobe control method?
What happens briefly after the strobe pulse is disabled in source-initiated strobe control?
What happens briefly after the strobe pulse is disabled in source-initiated strobe control?
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In destination-initiated strobe control, what is the role of the strobe pulse?
In destination-initiated strobe control, what is the role of the strobe pulse?
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What is the primary difference between source-initiated and destination-initiated strobe control?
What is the primary difference between source-initiated and destination-initiated strobe control?
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What difficulty in data transfer is overcome by using the hand shaking method?
What difficulty in data transfer is overcome by using the hand shaking method?
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In synchronous transmission, data is sent in the form of:
In synchronous transmission, data is sent in the form of:
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What is present in asynchronous transmission but not in synchronous transmission?
What is present in asynchronous transmission but not in synchronous transmission?
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What is the main advantage of asynchronous transmission?
What is the main advantage of asynchronous transmission?
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What is the purpose of the second control signal in the hand shaking method?
What is the purpose of the second control signal in the hand shaking method?
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Which of the following types of transmission is slow?
Which of the following types of transmission is slow?
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Study Notes
Asynchronous Data Transfer
- Asynchronous data transfer takes place in two ways: Strobe Control and Hand Shaking.
Strobe Control
- Uses a single control line to time each transfer.
- The strobe can be activated by the source or the destination unit.
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Source Initiated Data Transfer:
- The data bus carries information from source to destination.
- The strobe signal informs the destination unit when a data word is available in the bus.
- The strobe signal is given after a brief delay, after placing the data on the data bus.
- A brief period after the strobe pulse is disabled, the source stops sending the data.
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Destination Initiated Data Transfer:
- The destination unit activates the strobe pulse, informing the source to send data.
- The source places the data on the data bus.
- The transmission is stopped briefly after the strobe pulse is removed.
- Disadvantages of strobe control:
- The source unit has no way of knowing whether the destination unit has received the data or not.
- The destination unit has no way of knowing whether the source unit has placed data on the bus or not.
Hand Shaking Method of Data Transfer
- Solves the difficulties of strobe control by using a second control signal that provides a reply to the unit that initiates the transfer.
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Source Initiated Transfer Using Hand Shaking:
- The Fig. 4.4 shows the data transfer procedure when initiated by the source.
Comparison of Synchronous and Asynchronous Data Transfer
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Synchronous Transmission:
- Transmission starts with a block header which holds a sequence of bits.
- Data is sent in the form of blocks or frames. +Present with the same clock pulse.
- Advantages: Fast, efficient use of transmission line, and no gap between data.
- Disadvantage: Costly.
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Asynchronous Transmission:
- Uses start and stop bits preceding and following a character respectively.
- Data is sent in the form of byte or character.
- Absent with the same clock pulse.
- Advantages: Economical, and transmission line remains empty during gap in character transmission.
- Disadvantages: Slow, and there is a gap between data.
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Description
Learn about the different methods of asynchronous data transfer in computer organization, including strobe control and handshaking. Understand the concepts of source initiated and destination initiated data transfer.
