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US 5,862,350 AGranted
Method and mechanism for maintaining integrity within SCSI bus with hot insertion
AssigneeIntel Corporation
InventorRichard L. Coulson
Life of this patent
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AssigneeIntel Corporation
InventorRichard L. Coulson
Estimating the term…
A mechanism and method for quiescing a SCSI bus by asserting the busy signal just prior to the SCSI signal pins making contact or decoupling during a hot modification. A hot modification is an insertion, removal or exchange of a device coupled to a SCSI interface bus while the system is operating (e.g., not powered down). By asserting the busy line for a predetermined and short period of time during the disturbance of the SCSI signal pins, glitches or noise introduced by the coupling or decoupling of the signal lines is isolated and prevented from causing transmission errors over the SCSI bus. According to the system described, any communication over the SCSI bus made just prior to the hot modification is allowed to complete before the signal pins are interrupted. For hot insertions, the system utilizes longer pins on the connector to assert the busy line just before coupling of the other pins of the connector. For removal, a special pair of short pins are placed on the connector to assert busy when decoupled. In either case, the busy line is then maintained as asserted for a predetermined period of time after the initial assertion to allow for communication over the SCSI bus to terminate before the hot modification.
A method of connecting a device to a single ended SCSI bus that is in use while maintaining data integrity, wherein said single ended SCSI bus includes a busy line and wherein said device includes a connector with signal pins that mate with said single ended SCSI bus, said method comprising the steps of:
A system for connecting a device to a single ended SCSI bus that is in use while maintaining data integrity, wherein said single ended SCSI bus includes a busy line and wherein said device includes a connector with signal pins, said system comprising:
A system for coupling a device to a single ended SCSI bus that is in use while maintaining data integrity, wherein said single ended SCSI bus includes a busy line said system comprising:
A method of disconnecting a device from a single ended SCSI bus that is in use while maintaining data integrity, wherein said single ended SCSI bus includes a busy line and wherein said device includes a connector with signal pins that mate with said single ended SCSI bus, said method comprising the steps of:
Dependencies are inferred from the claim text.