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

• US 6,728,815 B1
• Filed: 12/20/2000
• Issued: 04/27/2004
• Est. Priority Date: 12/20/2000
• Status: Expired due to Fees

• Current Assignee: RPX Corporation
• Original Assignee: Adaptec Incorporated (Steel Partners Holdings LP)
• Inventors: Young, B. Arlen
• Primary Examiner(s): Ray, Gopal C.
• Application Number:
  US09/745,105
• Time in Patent Office: 1,224 Days
• Field of Search: 710/305, 710/105, 710/300, 710/36, 709/200, 709/203, 709/236, 370/389, 370/463, 370/464, 370/912
• US Class Current: 710/305
• CPC Class Codes: G06F 13/4269 using a handshaking protocol, e.g. Centronics connection
• CPC Class Codes: Y10S 370/912 Packet communications

Abstract

A method for data streaming by a SCSI target includes transmitting a data packet information unit in a Packetized SCSI Protocol Data In phase. The SCSI target also generates a signal during the Packetized SCSI Protocol Data In phase to indicate whether a header packet information unit or another data packet information unit is to be transmitted next in the Packetized SCSI Protocol Data In phase.

Claims

1. A method comprising:

transmitting, by a SCSI target, a data packet information unit in a Packetized SCSI Protocol Data In phase; and

generating a signal, by said SCSI target, during said Packetized SCSI Protocol Data In phase to indicate whether a header packet information unit or another data packet information unit is to be transmitted next in said Packetized SCSI Protocol Data In phase.

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

driving said signal for a parity signal line of a SCSI bus.

3. The method of claim 2 wherein said driving said signal further comprises:

asserting said signal for said parity signal line to indicate said header packet information unit is to be transmitted next in said Packetized SCSI Protocol Data In phase.

4. The method of claim 1 wherein said generating a signal further comprises:

asserting a signal, for a line of a SCSI bus, to indicate said header packet information unit is to be transmitted next in said Packetized SCSI Protocol Data In phase.

5. A method comprising:

transmitting a header packet information unit by a SCSI target in a Packetized SCSI Protocol Data In phase; and

transmitting a plurality of data packet information units, one immediately after another, by said SCSI target in said Packetized SCSI Protocol Data In phase.

6. The method of claim 5 further comprising:

asserting a signal for a SCSI bus line, by said SCSI target 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.

7. The method of claim 6 further comprising:

transmitting said another header packet information unit by said SCSI target in said Packetized SCSI Protocol Data In phase.

8. The method of claim 7 further comprising:

transmitting another data packet information unit by said SCSI target in said Packetized SCSI Protocol Data In phase following transmission of said another header packet information unit.

9. A method comprising:

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

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

determining whether to transmit another header packet information unit in said Packetized SCSI Protocol Data In phase, or to transmit another data packet information unit in said Packetized SCSI Protocol Data In phase following transmission of said plurality of data packet information units.

10. The method of claim 9 further comprising:

asserting a signal for a SCSI bus line, by a SCSI target 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 upon determining to transmit said another header packet information unit.

11. The method of claim 10 further comprising:

transmitting said another header packet information unit by said SCSI target in said Packetized SCSI Protocol Data In phase.

12. The method of claim 11 further comprising:

transmitting another data packet information unit by said SCSI target in said Packetized SCSI Protocol Data In phase.

13. The method of claim 9 further comprising:

transmitting said another data packet information unit by said SCSI target in said Packetized SCSI Protocol Data In phase upon determining not to transmit said another header packet information unit.

14. A SCSI target device comprising:

a read streaming module configured to perform a method comprising;

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

generating a signal during said Packetized SCSI Protocol Data In phase to indicate whether a header packet information unit or another data packet information unit is to be transmitted next in said Packetized SCSI Protocol Data In phase.

15. The SCSI target device of claim 14 wherein said generating a signal further comprises:

driving said signal for a parity signal line of a SCSI bus.

16. The SCSI target device of claim 15 wherein said driving said signal further comprises:

asserting said signal for said parity signal line to indicate said header packet information unit is to be transmitted next in said Packetized SCSI Protocol Data In phase.

17. The SCSI target device of claim 14 wherein said generating a signal further comprises:

asserting a signal, for a line of a SCSI bus, to indicate said header packet information unit is to be transmitted next in said Packetized SCSI Protocol Data In phase.

18. A SCSI target device comprising:

a read streaming module configured to perform a method comprising;

entering a Packetized SCSI Protocol Data In phase;

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

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

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

asserting a signal for 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 upon determining to transmit said another header packet information unit.

19. The SCSI target device of claim 18, said method further comprising:

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

20. The SCSI target device of claim 19 further comprising:

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