Adaptec AHA-2742T User Manual - Page 117

AHA-2740 Series User's Manual Synchronous Data Transfer Negotiation The message exchange between the initiator and the target that allows the negotiation of the data transfer frequency and delay between requests and acknowledgments required for synchronous data transfer. Once negotiated, synchronous data transfer parameters remain unchanged until certain re-initialization activities occur. T Tagged Queuing A SCSI-2 feature that allows the SCSI device to return data in a different order than requested by the SCSI host adapter. Target (or Target Device) A SCSI device that performs an operation requested by an initiator. The target may be a peripheral device such as a disk drive performing a service for an initiator. The target may also be a host adapter performing a processor-type device service for an initiator. Termination A physical requirement of the SCSI bus. The devices at the physical ends of the SCSI bus must have terminating resistors either installed or enabled; devices in the middle of the bus must have terminating resistors either removed or disabled. W Word A 2-byte (16-bit) unit of data. Z Zero Latency Reads A Method of minimizing mechanical limitations of fixed disk by requesting data in an unordered sequence. The data is reordered by the host adapter. Ì Glossary-12 Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page G-12) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93