Method and structure for supporting data streaming by a SCSI initiator during the data in phase of the packetized SCSI protocol

• US 6,826,646 B1
• Filed: 12/20/2000
• Issued: 11/30/2004
• Est. Priority Date: 12/20/2000
• Status: Expired due to Fees

• Current Assignee: PMC-Sierra Incorporated (Microchip Technology Incorporated)
• Original Assignee: Adaptec Incorporated (Steel Partners Holdings LP)
• Inventors: Young, B. Arlen
• Primary Examiner(s): Dang, Khanh
• Application Number:
  US09/745,106
• Time in Patent Office: 1,441 Days
• Field of Search: 710/313, 710/5, 710/36, 710/112, 710/113, 710/20, 710/74, 710/105, 710/106, 370/389, 370/462
• US Class Current: 710/313
• CPC Class Codes: G06F 13/423 with synchronous protocol

Abstract

A method for supporting data streaming by a SCSI initiator includes receiving a data packet information unit in a Packetized SCSI Protocol Data In phase. The SCSI initiator also receives a signal in said Packetized SCSI Protocol Data In phase to indicate whether a header packet information unit or another data packet information unit is to be received next in said Packetized SCSI Protocol Data In phase.

Claims

1. A method for supporting data streaming by a SCSI initiator using a Packetized SCSI Protocol, said method comprising:

receiving a data packet information unit in a Packetized SCSI Protocol Data In phase by said SCSI initiator; and

receiving a signal from a parity signal line of a SCSI bus by said SCSI initiator in said Packetized SCSI Protocol Data In phase to indicate whether a header packet information unit or another data packet information unit is to be received next in said Packetized SCSI Protocol Data In phase.

2. The method of claim 1 wherein said receiving a signal further comprises:

interpreting an asserted signal from said parity signal line to indicate said header packet information unit is to be received next in said Packetized SCSI Protocol Data In phase.

3. A method comprising:

receiving a header packet information unit by a SCSI initiator in a Packetized SCSI Protocol Data In phase;

receiving a plurality of data packet information units, one immediately after another, by said SCSI initiator in said Packetized SCSI Protocol Data In phase; and

determining whether a signal on a SCSI hub line has been asserted during said Packetized SCSI Protocol Data In phase to indicate transmission of another header packet information unit in said Packetized SCSI Protocol Data In phase.

4. The method of claim 3 further comprising:

receiving said another header packet information unit by said SCSI initiator in said Packetized SCSI Protocol Data In phase upon determining said signal has been asserted.

5. The method of claim 4 further comprising:

receiving another data packet information unit by said SCSI initiator in said Packetized SCSI Protocol Data In phase following receipt of said another header packet information unit.

6. A method comprising:

receiving a header packet information unit in a Packetized SCSI Protocol Data In phase;

receiving a data packet information unit in said Packetized SCSI Protocol Data In phase; and

determining whether another header packet information unit or another data packet information unit is to be received next in said Packetized SCSI Protocol Data In phase wherein said determining further comprises;

interpreting an asserted signal, on a SCSI bus line during said Packetized SCSI Protocol Data In phase, to indicate transmission of said another header packet information unit in said Packetized SCSI Protocol Data In phase.

7. The method of claim 6 further comprising:

receiving said another header packet information unit by a SCSI initiator in said Packetized SCSI Protocol Data In phase.

8. The method of claim 6 further comprising:

receiving said another data packet information unit by a SCSI initiator in said Packetized SCSI Protocol Data In phase upon determining not to receive said another header packet information unit.

9. A SCSI initiator device comprising:

a read streaming module configured to perform a method comprising;

receiving a data packet information unit in a Packetized SCSI Protocol Data In phase; and

receiving said a signal from a parity signal line of a SCSI bus in said Packetized SCSI Protocol Data In phase to indicate whether a header packet information unit or another data packet information unit is to be received next in said Packetized SCSI Protocol Data In phase.

10. The SCSI initiator device of claim 9 wherein said receiving a signal further comprises:

interpreting an asserted signal from said parity signal line to indicate said header packet information unit is to be received next in said Packetized SCSI Protocol Data In phase.

11. A SCSI initiator device comprising:

a read streaming module configured to perform a method comprising;

receiving a data packet information unit in a Packetized SCSI Protocol Data In phase; and

receiving a signal in said Packetized SCSI Protocol Data In phase to indicate whether a header packet information unit or another data packet information unit is to be received next in said Packetized SCSI Protocol Data In phase, wherein said receiving a signal further comprises;

interpreting an asserted signal, on a line of a SCSI bus, to indicate said header packet information unit is to be received next in said Packetized SCSI Protocol Data In phase.

12. A SCSI initiator device comprising:

a read streaming module configured to perform a method comprising;

receiving a header packet information unit in a Packetized SCSI Protocol Data In phase;

receiving a data packet information unit in said Packetized SCSI Protocol Data In phase;

determining whether to receive another header packet information unit or another data packet information unit in said Packetized SCSI Protocol Data In phase; and

interpreting an asserted a signal on a SCSI bus line, during said Packetized SCSI Protocol Data In phase, to indicate said another header packet information unit is to be received next in said Packetized SCSI Protocol Data In phase.

13. The SCSI initiator device of claim 12, said method further comprising:

receiving said another header packet information unit in said Packetized SCSI Protocol Data In phase.

14. The SCSI initiator device of claim 12 said method further comprising:

receiving said another data packet information unit in said Packetized SCSI Protocol Data In phase.