Method and apparatus for improved peripheral bus utilization

• US 5,968,147 A
• Filed: 09/26/1997
• Issued: 10/19/1999
• Est. Priority Date: 09/26/1997
• Status: Expired due to Term

• Current Assignee: Rovi Technologies Corporation (Adeia Inc.)
• Original Assignee: Adaptec Incorporated (Steel Partners Holdings LP)
• Inventors: Polfer, Daniel A., Berhan, Michael D., Diemer, Peter C., D'Amato, Andrea, McMurdie, Michael S.
• Primary Examiner(s): Auve, Glenn A.
• Assistant Examiner(s): Dharia, Rupal
• Application Number:
  US08/938,110
• Time in Patent Office: 753 Days
• Field of Search: 395/872, 395/877, 395/750, 364/707, 711/154, 711/157, 711/156, 369/54, 369/60, 710/52, 710/57, 713/300-340
• US Class Current: 710/52
• CPC Class Codes: G06F 13/20 for access to input/output bus

Abstract

Disclosed is a system for minimizing the utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus. The system has a second peripheral device that shares the I/O bus connection. The system includes the operations of transferring data to a drive buffer that is in the first data-writing peripheral device. The transferring being configured to continue until the drive buffer has reached a full state. Performing a pre-write calibration of the first data-writing peripheral device after the drive buffer has reached the full state. Commencing a writing of a portion of the data contained in the drive buffer, such that the first data received by the drive buffer is written first. The system further including releasing the I/O bus connection by placing a write thread of the first data-writing peripheral device in a sleep mode. Wherein when the write thread of the first data-writing peripheral device is in the sleep mode the I/O bus connection is made available to the second peripheral device while the first data-writing peripheral device is not transferring data. The system further includes continually bring the write thread of the first data-writing peripheral device out of the sleep mode to perform a data burst when the drive buffer has emptied to a critical level and then placing the write thread back to the sleep mode after the data burst.

Claims

1. A method for sharing an I/O bus connection by peripheral devices, the peripheral devices including a first CD-R peripheral device that is connected to the I/O bus connection, and a second peripheral device that is connected to the I/O bus connection, the I/O bus being an IDE/ATAPI bus connection, the first CD-R peripheral device and the second peripheral device being IDE/ATAPI devices, comprising:

transferring data to a drive buffer that is in the first CD-R peripheral device, the transferring being configured to continue until the drive buffer has reached a full state;

performing a pre-write calibration of the first CD-R peripheral device after the drive buffer has reached the full state;

commencing a writing of a portion of the data contained in the drive buffer to a compact disc, such that the first data received by the drive buffer is written first; and

releasing the I/O bus connection by placing a write thread of the first CD-R peripheral device in a sleep mode but still continuing the writing of the portion of data contained in the drive buffer, such that when the write thread of the first CD-R peripheral device is in the sleep mode the 1/0 bus connection is made available to the second peripheral device while the first CD-R peripheral device is not transferring data to the drive buffer.

2. A method for sharing an I/O bus connection by peripheral devices as recited in claim 1, further comprising:

determining when the data contained in the drive buffer has been reduced to a critical level.

3. A method for sharing an I/O bus connection by peripheral devices as recited in claim 2, wherein when the drive buffer has been reduced to a critical level, the method includes:

querying the first CD-R peripheral device to ascertain an actual amount of free space in the drive buffer.

4. A method for sharing an I/O bus connection by peripheral devices as recited in claim 3, wherein when the actual amount of free space in the drive buffer is ascertained, the write thread of the first CD-R peripheral device is configured to wake from the sleep mode.

5. A method for sharing an I/O bus connection by peripheral devices as recited in claim 4, wherein when the write thread of the first CD-R peripheral device has awaken from the sleep mode, a burst of data that is configured to fill the actual amount of free space in the drive buffer is performed.

6. A method for sharing an I/O bus connection by peripheral devices as recited in claim 5, wherein the burst of data is a transfer of data from an allocated memory in a host to the drive buffer.

7. A method for sharing an I/O bus connection by peripheral devices as recited in claim 6, wherein the transfer of data from the allocated memory in the host to the drive buffer is performed at a bus speed as a RAM-to-RAM operation.

10. A method for sharing an I/O bus connection by peripheral devices as recited in claim 1, further comprising:

transferring data from a source media to a system buffer of a host before the transfer of the data to the drive buffer of the first CD-R is performed, the transfer of the data from the source media to the system buffer being configured to continue until the system buffer reaches a full state.

8. A method for sharing an I/O bus connection by peripheral devices, the peripheral devices including a first CD-R peripheral device that is connected to the I/O bus connection, and a second peripheral device that is connected to the I/O bus connection, comprising:

transferring data to a drive buffer that is in the first CD-R peripheral device, the transferring being configured to continue until the drive buffer has reached a full state;

performing a pre-write calibration of the first CD-R peripheral device after the drive buffer has reached the full state;

commencing a writing of a portion of the data contained in the drive buffer to a compact disc, such that the first data received by the drive buffer is written first;

releasing the I/O bus connection by placing a write thread of the first CD-R peripheral device in a sleep mode but still continuing the writing of the portion of data contained in the drive buffer, such that when the write thread of the first CD-R peripheral device is in the sleep mode the bus connection is made available to the second peripheral device while the first CD-R peripheral device is not transferring data to the drive buffer;

determining when the data contained in the drive buffer has been reduced to a critical level, wherein when the drive buffer has been reduced to a critical level, the method further includes,

querying the first CD-R peripheral device to ascertain an actual amount of free space in the drive buffer, and when the actual amount of free space in the drive buffer is ascertained, the write thread of the first CD-R peripheral device is configured to wake from the sleep mode, and when the write thread of the first CD-R peripheral device has awaken from the sleep mode, a burst of data that is configured to fill the actual amount of free space in the drive buffer is performed; and

determining whether the first CD-R peripheral device has written an entire track.

9. A method for sharing an I/O bus connection by peripheral devices as recited in claim 8, wherein when the entire track has been written by the first CD-R peripheral device, and a new track is required to be written, the method further comprises:

performing an initial transfer of data for the new track, the transfer being configured to continue until the drive buffer has reached the full state.

11. A system for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus, the system also includes a second peripheral device that shares the I/O bus connection, the I/O bus being an IDE/ATAPI bus connection, the first data-writing peripheral device and the second peripheral device being IDE/ATAPI devices, comprising:

transferring data to a drive buffer that is in the first data-writing peripheral device, the transferring being configured to continue until the drive buffer has reached a full state;

performing a pre-write calibration of the first data-writing peripheral device after the drive buffer has reached the full state;

commencing a writing of a portion of the data contained in the drive buffer to a compact disc, such that the first data received by the drive buffer is written first; and

releasing the I/O bus connection by placing a write thread of the first data-writing peripheral device in a sleep mode but still continuing the writing of the portion of data contained in the drive buffer, such that when the write thread of the first data-writing peripheral device is in the sleep mode the I/O bus connection is made available to the second peripheral device while the first data-writing peripheral device is not transferring data to the drive buffer.

12. A system for minimizing utilization of an I/O bus by a first data-writing peripheral device as recited in claim 11, further comprising:

determining when the data contained in the drive buffer has been reduced to a critical level.

13. A system for minimizing utilization of an I/O bus by a first data-writing peripheral device as recited in claim 12, wherein when the drive buffer has been reduced to a critical level, the method includes:

querying the first data-writing peripheral device to ascertain an actual amount of free space in the drive buffer.

14. A system for minimizing utilization of an I/O bus by a first data-writing peripheral device as recited in claim 13, wherein when the actual amount of free space in the drive buffer is ascertained, the write thread of the first data-writing peripheral device is configured to wake from the sleep mode.

15. A system for minimizing utilization of an I/O bus by a first data-writing peripheral device as recited in claim 14, wherein when the write thread of the first data-writing peripheral device has come out of the sleep mode, the a burst of data that is configured to fill the actual amount of free space in the drive buffer is performed by the write thread.

16. A system for minimizing utilization of an I/O bus by a first data-writing peripheral device as recited in claim 15, wherein the burst of data is a transfer of data from an allocated memory in a host to the drive buffer.

17. A system for minimizing utilization of an I/O bus by a first data-writing peripheral device as recited in claim 16, wherein the transfer of data from the allocated memory in the host to the drive buffer is performed at a bus speed as a RAM-to-RAM operation.

18. A system for minimizing utilization of an I/O bus by a first data-writing peripheral device as recited in claim 11, wherein the first data-writing peripheral device is selected from the group consisting of a CD-R peripheral device, a CD-RW peripheral device and a DVD peripheral device.

19. An apparatus for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus, the apparatus also includes a second peripheral device that shares the I/O bus connection, the I/O bus being an IDE/ATAPI bus connection, the first data-writing peripheral device and the second peripheral device being IDE/ATAPI devices, comprising:

a drive buffer that is contained in the first data-writing peripheral device is configured to receive data until the drive buffer has reached a full state;

a writing mechanism of the first data-writing peripheral device being configured to commence writing of a portion of the data contained in the drive buffer to a compact disc; and

wherein a write thread of the first data-writing peripheral device is paced into a sleep mode while the writing mechanism is writing the portion of the data contained in the drive buffer, such that when the write thread of the first data-writing peripheral device is in the sleep mode, the I/O bus connection is made available to the second peripheral device.

20. An apparatus for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus as recited in claim 19, wherein when the write thread of the first data-writing peripheral device is in the sleep mode when the drive buffer is not receiving data.

21. An apparatus for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus as recited in claim 20, wherein a pre-write calibration unit of the first data-writing peripheral device performs pre-write calibration after the drive buffer has reached the full state and before the writing mechanism of the first data-writing peripheral device commences writing.

22. An apparatus for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus as recited in claim 21, wherein a critical level is reached when data contained in the drive buffer has been reduced to a predetermined amount.

23. An apparatus for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus as recited in claim 22, wherein the first data-writing peripheral device is contacted when the critical level is reached to ascertain an exact level of available space in the drive buffer.

24. An apparatus for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus as recited in claim 23, wherein the drive buffer is provided with a data burst to fill up the exact level of available space in the drive buffer.

25. An apparatus for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus as recited in claim 23, wherein the write thread of the first data-writing peripheral devices is reverted back to the sleep mode until a next critical level.

26. An apparatus for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus as recited in claim 25, wherein the first data-writing peripheral device is selected from the group consisting of a CD-R peripheral device, a CD-RW peripheral device and a DVD peripheral device.

27. A computer readable media containing program instructions to be executed on a central processing unit for minimizing utilization of an I/O bus by a first data-writing peripheral device that is connected to the I/O bus, a second peripheral device is also configured to share the I/O bus connection, the I/O bus being an IDE/ATAPI bus connection, the first data-writing peripheral device and the second peripheral device being IDE/ATAPI devices, the computer readable media comprising:

program instructions for transferring data to a drive buffer that is in the first data-writing peripheral device, the transferring being configured to continue until the drive buffer has reached a full state;

program instructions for commencing a writing of a portion of the data contained in the drive buffer to a compact disc; and

program instructions for releasing the I/O bus connection by placing a write thread of the first data-writing peripheral device in a sleep mode but still continuing the writing of the portion of data contained in the drive buffer, such that when the write thread of the first data-writing peripheral device is in the sleep mode the I/O bus connection is made available to the second peripheral device while the first data-writing peripheral device is not transferring data to the drive buffer.

28. A computer readable media containing program instructions to be executed on a central processing unit for minimizing utilization of an I/O bus as recited in claim 27, further including program instructions for causing the a first data-writing peripheral device to re-acquire the I/O bus when the drive buffer has reached a critical level.

29. A computer readable media containing program instructions to be executed on a central processing unit for minimizing utilization of an I/O bus as recited in claim 28, further including program instructions for transferring data to the drive buffer to place the drive buffer in the full state;

and

program instructions for placing the write thread of the first data-writing peripheral device back to the sleep mode until a next critical level is reached.

30. A method for sharing an I/O bus connection by peripheral devices, the peripheral devices including a first CD-R peripheral device that is connected to the I/O bus connection, and a second peripheral device that is connected to the I/O bus connection, comprising:

transferring data to a drive buffer that is in the first CD-R peripheral device, the transferring being configured to continue until the drive buffer has reached a substantially full state;

commencing a writing of a portion of the data contained in the drive buffer;

releasing the I/O bus connection by placing the first CD-R peripheral device in a sleep mode but still continuing the writing of the portion of data contained in the drive buffer, such that when the first CD-R peripheral device is in the sleep mode the I/O bus connection is made available to the second peripheral device while the first CD-R peripheral device is not transferring data to the drive buffer;

determining when the data contained in the drive buffer has been reduced to a critical level, and when the drive buffer has been reduced to a critical level, the method further includes,

querying the first CD-R peripheral device to ascertain an actual amount of free space in the drive buffer, and when the actual amount of free space in the drive buffer is ascertained, the first CD-R peripheral device is configured to wake from the sleep mode and receive a burst of data to substantially fill the actual amount of free space in the drive buffer.

31. A method for sharing an I/O bus connection by peripheral devices as recited in claim 30, further comprising:

determining whether the first CD-R peripheral device has written an entire track.

32. A method for sharing an I/O bus connection by peripheral devices as recited in claim 31, wherein when the entire track has been written by the first CD-R peripheral device, and a new track is required to be written, the method further comprises:

performing an initial transfer of data for the new track, the transfer being configured to continue until the drive buffer has reached the substantially full state.