Method and structure for supporting flow control by a SCSI initiator during the data out phase of the packetized SCSI protocol
First Claim
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1. A method for supporting flow control by a SCSI initiator using a Packetized SCSI Protocol, said method comprising:
- transmitting a data packet information unit in a Packetized SCSI Protocol Data Out phase by said SCSI initiator following receiving a header packet information unit, in a Packetized SCSI Protocol Data In phase, by said SCSI initiator from a SCSI target wherein information is exchanged between said SCSI initiator and said SCSI target either in said Packetized SCSI Protocol Data Out phase or in said Packetized SCSI Protocol Data In phase; and
receiving a signal by said SCSI initiator, in said Packetized SCSI Protocol Data Out phase during transfer of said data packet information unit, to indicate whether another data packet information unit is to be transmitted by said SCSI initiator in said Packetized SCSI Protocol Data Out phase wherein said signal is generated by said SCSI target on a SCSI bus.
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Abstract
A method for supporting flow control by a SCSI initiator using a Packetized SCSI Protocol includes transmitting a data packet information unit in a Packetized SCSI Protocol Data Out phase. The SCSI initiator also receives a signal in said Packetized SCSI Protocol Data Out phase to indicate whether another data packet information unit is to be transmitted in said Packetized SCSI Protocol Data Out phase.
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Citations
10 Claims
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1. A method for supporting flow control by a SCSI initiator using a Packetized SCSI Protocol, said method comprising:
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transmitting a data packet information unit in a Packetized SCSI Protocol Data Out phase by said SCSI initiator following receiving a header packet information unit, in a Packetized SCSI Protocol Data In phase, by said SCSI initiator from a SCSI target wherein information is exchanged between said SCSI initiator and said SCSI target either in said Packetized SCSI Protocol Data Out phase or in said Packetized SCSI Protocol Data In phase; and receiving a signal by said SCSI initiator, in said Packetized SCSI Protocol Data Out phase during transfer of said data packet information unit, to indicate whether another data packet information unit is to be transmitted by said SCSI initiator in said Packetized SCSI Protocol Data Out phase wherein said signal is generated by said SCSI target on a SCSI bus. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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transmitting a plurality of data packet information units, one immediately after another, by a SCSI initiator in a Packetized SCSI Protocol Data Out phase following receiving a header packet information unit, in a Packetized SCSI Protocol Data In phase, by said SCSI initiator from a SCSI target wherein information is exchanged between said SCSI initiator and said SCSI target either in said Packetized SCSI Protocol Data Out phase or in said Packetized SCSI Protocol Data In phase; and monitoring a signal level, from a SCSI target, on a parity line of a SCSI bus by said SCSI initiator to determine whether said transmitting a plurality of data packet information units is to be terminated. - View Dependent Claims (6)
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7. A method comprising:
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transmitting a data packet information unit in a Packetized SCSI Protocol Data Out phase by a SCSI initiator following receiving a header packet information unit, in a Packetized SCSI Protocol Data In phase, by said SCSI initiator from a SCSI target wherein information is exchanged between said SCSI initiator and said SCSI target either in said Packetized SCSI Protocol Data Out phase or in said Packetized SCSI Protocol Data In phase; and determining, by said SCSI initiator, whether another data packet information unit is to be transmitted in said Packetized SCSI Protocol Data Out phase by monitoring a signal level, from said SCSI target, on a parity line of a SCSI bus. - View Dependent Claims (8, 9)
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10. A SCSI initiator device comprising:
a flow control module configured to perform a method comprising; transmitting a data packet information unit in a Packetized SCSI Protocol Data Out phase following receiving a header packet information unit, in a Packetized SCSI Protocol Data In phase, by said SCSI initiator from a SCSI target wherein information is exchanged between said SCSI initiator and said SCSI target either in said Packetized SCSI Protocol Data Out phase or in said Packetized SCSI Protocol Data In phase; monitoring a signal, from said SCSI target, on a parity bit line of a SCSI bus, in said Packetized SCSI Protocol Data Out phase, by said SCSI initiator to determine whether another data packet information unit is to be transmitted in said Packetized SCSI Protocol Data Out phase; and interpreting an asserted signal on said parity bit line to indicate said another data packet information unit is not to be transmitted in said Packetized SCSI Protocol Data Out phase.
Specification