Explanation: In asynchronous parallel Small Computer System Interface (SCSI) data transfer method, each phase of data transfer is allotted with fixed time. If the floppy disk is removed during the data transmission, then the error may be occurred in any phase of data transfer. Bus free: The bus is said to be in “bus free” state if the data transmission is completed. By removing the target, the floppy disk cannot free the bus. Hence, the error occurs in bus free phase. Selection: The target on the bus includes the address of floppy disk and increases the SEL signal and decreases the BSY line. By removing the target, the BSY signal cannot be increased. Hence, the error occurs in selection phase. Command: The change in the SEL signals doesn’t affect the command line, request signal and data transfer. Hence, the error occurs in command phase. Data: The error occurred after the completion of data transmission doesn’t change the bus mode, command signal and input/output line...

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Chapter 13, Problem 3E

a.

Explanation of Solution

Explanation:

In asynchronous parallel Small Computer System Interface (SCSI) data transfer method, each phase of data transfer is allotted with fixed time.

If the floppy disk is removed during the data transmission, then the error may be occurred in any phase of data transfer.

Bus free: The bus is said to be in “bus free” state if the data transmission is completed. By removing the target, the floppy disk cannot free the bus. Hence, the error occurs in bus free phase.

Selection: The target on the bus includes the address of floppy disk and increases the SEL signal and decreases the BSY line. By removing the target, the BSY signal cannot be increased. Hence, the error occurs in selection phase.

Command: The change in the SEL signals doesn’t affect the command line, request signal and data transfer. Hence, the error occurs in command phase.

Data: The error occurred after the completion of data transmission doesn’t change the bus mode, command signal and input/output line...

b.

Explanation of Solution

Explanation:

In asynchronous parallel Small Computer System Interface (SCSI) data transfer method, each phase of data transfer is allotted with fixed time.

If the floppy disk is removed during the data transmission, then the error may be occurred in any phase of data transfer.

Bus free: The bus is said to be in “bus free” state if the data transmission is completed. By removing the target, the floppy disk cannot free the bus. Hence, the error occurs in bus free phase.

Selection: The target on the bus includes the address of floppy disk and increases the SEL signal and decreases the BSY line. By removing the target, the BSY signal cannot be increased. Hence, the error occurs in selection phase.

Command: The change in the SEL signals doesn’t affect the command line, request signal and data transfer. Hence, the error occurs in command phase.

Data: The error occurred after the completion of data transmission doesn’t change the bus mode, command signal and input/output line...

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