Adaptec AHA-2742T User Manual - Page 116
SCSI Device, SCSI ID, Single-Ended, Single-Threaded Operation, Small Computer Systems Interface,
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Glossary SCSI Device A device such as a host adapter board, fixed disk drive or CDROM drive that conforms to the SCSI interface standard and is attached to a SCSI bus cable. The device may be an initiator, a target, or capable of both types of operation. SCSI ID An identifier assigned to SCSI devices that enables them to communicate with a computer when they are attached to a host adapter via the SCSI bus. Each SCSI host adapter board has eight available SCSI IDs with the numbers 0 through 7. Usually the host adapter itself is assigned SCSI ID 7, and fixed disk devices are assigned to SCSI IDs 0 and 1. Single-Ended A term referring to the electrical characteristics of the signals used on the SCSI bus interface. Single-ended signals occupy a single conductor and are references to a common ground carried on the cable between the SCSI components attached. Most SCSI devices use single-ended grounding. Some SCSI devices use a differential grounding scheme. These devices are not supported by the AHA-2740 Series. Differential devices may be damaged if you connect them and the AHA-2740 Series to the same SCSI bus. Single-Threaded Operation Operation of the computer system such that only one program can be operating or active at a time. The system must wait until all resources are available before starting an operation, and it cannot start another operation until the first one is completed. Small Computer Systems Interface See SCSI. Synchronous Data Transfer A method of data transfer in which data on the SCSI bus is clocked with fixed-length, fixed-frequency strobe pulses. The acknowledgments may be delayed several clock periods from the data requests. Synchronous data transfer can be used only for data transmission on the SCSI bus. It cannot be used for command, message, and status transmission. Glossary-11 Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page G-11) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93