Patent Number: 6,167,470

Title: SCSI system capable of connecting maximum number of high speed SCSI devices with maintaining positive operation

Abstract: A SCSI system including a SCSI controller, daisy-chained SCSI connectors to which SCSI devices are to be connected, and a SCSI cable interconnecting the SCSI connectors. The SCSI controller includes a circuit for controlling a REQ signal that is allowed to flow through two lines in the SCSI cable, and for controlling an ACK signal that is also allowed to flow through another two lines in the SCSI cable. One of the two lines for conveying the REQ signal alternately connects an unused pin and a REC pin of two successive SCSI connectors, and the other of the two lines alternately connects a REQ pin and an unused pin of the two successive controllers. The two lines for conveying the ACK signal interconnect the SCSI connectors in a similar manner. This enables the load capacitance of the REQ and ACK control signal lines to be reduced, thereby ensuring normal operation of up to seven high speed SCSI devices, that is, the maximum number of devices connectable to the SCSI system.

Inventors: Ishii; Masahiro (Tokyo, JP)

Assignee: Mitsubishi Denki Kabushiki Kaisha

International Classification: G06F 13/42 (20060101); G06F 013/12 ()

Expiration Date: 12/26/2017