This international standard defines the mechanical, electrical, timing, and protocol requirements of the SCSI parallel interface to allow conforming devices to interoperate. The SCSI parallel interface is a local I/O bus that may be operated over a wide range of transfer rates. The objectives of the SCSI parallel interface are
The interface protocol includes provision for the connection of multiple initiators (SCSI devices capable of initiating an I/O process) and multiple targets (SCSI devices capable of responding to a request to perform an I/O process). Distributed arbitration (i.e., bus-contention logic) is built into the architecture of SCSI. A default priority system awards interface control to the highest priority SCSI device that is contending for use of the bus and an optional fairness algorithm is defined.
This standard defines the physical attributes of an input/output bus for interconnecting computers and peripheral devices.
Figure 1 is intended to show the general structure of SCSI standards. The figure is not intended to imply a relationship such as a hierarchy, protocol stack, or system architecture.
This international standard is intended as an alternate to the SCSI-3 Parallel Interface Standard. This international standard, in addition to containing all the information in the SCSI-3 Parallel Interface Standard contains information and specifications for LVD and fast-40 along with many other improvements.
| SDO | ISO: International Organization for Standardization |
| Document Number | ISO/IEC 14776 |
| Publication Date | Not Available |
| Language | en - English |
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| Committee | ISO/IEC/JTC 1/SC 25 |