Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral configuration
Patent
1998-01-16
2000-04-25
Lee, Thomas C.
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral configuration
710107, 710128, 710131, G06F 1314
Patent
active
060555823
ABSTRACT:
A computer system with a SCSI backplane board has duplex-ready logic for switching the computer system between a SCSI simplex mode and a SCSI duplex mode. The duplex-ready logic includes a set of bus quick switches, a duplex-ready logic controller, and a set or sets of active terminators. The SCSI simplex mode and SCSI duplex mode are configured by the duplex-ready logic controller based on the number of SCSI cables present. If only a primary SCSI cable is present, the duplex-ready logic controller enables a SCSI simplex mode. To enable a SCSI simplex mode, the bus switches are enabled and the terminators are selectively enabled and/or disabled. If a primary SCSI cable and a secondary SCSI cable are present, the duplex-ready logic controller enables a SCSI duplex mode. To enable a SCSI duplex mode, the bus switches are disabled and the terminators are selectively disabled and/or enabled. The duplex-ready logic controller optionally may change to SCSI identification values for a set of SCSI devices for a SCSI duplex mode and restore the SCSI identification values for a SCSI simples mode. In manually configuring the state of the SCSI backplane for the secondary SCSI duplex mode, the chassis is minimally disassembled to allow for installation of a SCSI cable from a secondary SCSI controller to the SCSI duplex-ready backplane board. The SCSI duplex-ready backplane board both eliminates the need for a board changeout and a duplex-option kit and reduces the disassembly and reassembly required to configure the state of the SCSI backplane of a computer system for a SCSI simplex mode or a SCSI duplex mode.
REFERENCES:
patent: 5495584 (1996-02-01), Holman, Jr. et al.
patent: 5572685 (1996-11-01), Fisher et al.
patent: 5613074 (1997-03-01), Galloway
patent: 5745795 (1998-04-01), Pecone et al.
Quality Semiconductor, Inc., "High-Speed CMOS Quadruple Bus Switches with Individual Enables," QS3125 Preliminary, Aug. 1994, pp. 4-1 through 4-4.
Nguyen Vincent
Pascarella Randall J.
Compaq Computer Corporation
Kim Harold
Lee Thomas C.
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