Projekta Nr.ISO/IEC 14776-112:2002
Nosaukums<p>This international standard defines the mechanical, electrical, timing, and protocol requirements of the</p> <p>SCSI parallel interface to allow conforming devices to interoperate. The SCSI parallel interface is a local</p> <p>I/O bus that may be operated over a wide range of transfer rates. The objectives of the SCSI parallel</p> <p>interface are</p> <p>a) To provide host computers with device independence within a class of devices. Thus, different disk</p> <p>drives, tape drives, printers, optical media drives, and other devices may be added to the host</p> <p>computers without requiring modifications to generic system hardware. Provision is made for the</p> <p>addition of special features and functions through the use of vendor-specific options. Reserved areas</p> <p>are provided for future standardization.</p> <p>b) To provide compatibility such that properly conforming SCSI-2 devices may interoperate with</p> <p>SCSI-3 devices given that the systems engineering is correctly done. Properly conforming SCSI-2</p> <p>devices should respond in an acceptable manner to reject SCSI-3 protocol extensions. SCSI-3</p> <p>protocol extensions are designed to be permissive of such rejections and thus allow the SCSI-2</p> <p>devices to continue operation without requiring the use of the extension.</p> <p>The interface protocol includes provision for the connection of multiple initiators (SCSI devices capable of</p> <p>initiating an I/O process) and multiple targets (SCSI devices capable of responding to a request to perform</p> <p>an I/O process). Distributed arbitration (i.e., bus-contention logic) is built into the architecture of SCSI. A</p> <p>default priority system awards interface control to the highest priority SCSI device that is contending for</p> <p>use of the bus and an optional fairness algorithm is defined.</p> <p>This standard defines the physical attributes of an input/output bus for interconnecting computers and</p> <p>peripheral devices.</p> <p>Figure 1 is intended to show the general structure of SCSI standards. The figure is not intended to imply a</p> <p>relationship such as a hierarchy, protocol stack, or system architecture.</p> <p>Common Access Method</p> <p/> <p/> <p/> <p/> <p/> <p> <b>Figure 1 - General Structure of SCSI</b></p> <p>This international standard is intended as an alternate to the SCSI-3 Parallel Interface Standard. This</p> <p>international standard, in addition to containing all the information in the SCSI-3 Parallel Interface Standard</p> <p>contains information and specifications for LVD and fast-40 along with many other improvements.</p>
Reģistrācijas numurs (WIID)35308
Darbības sfēra<p>This international standard defines the mechanical, electrical, timing, and protocol requirements of the</p> <p>SCSI parallel interface to allow conforming devices to interoperate. The SCSI parallel interface is a local</p> <p>I/O bus that may be operated over a wide range of transfer rates. The objectives of the SCSI parallel</p> <p>interface are</p> <p>a) To provide host computers with device independence within a class of devices. Thus, different disk</p> <p>drives, tape drives, printers, optical media drives, and other devices may be added to the host</p> <p>computers without requiring modifications to generic system hardware. Provision is made for the</p> <p>addition of special features and functions through the use of vendor-specific options. Reserved areas</p> <p>are provided for future standardization.</p> <p>b) To provide compatibility such that properly conforming SCSI-2 devices may interoperate with</p> <p>SCSI-3 devices given that the systems engineering is correctly done. Properly conforming SCSI-2</p> <p>devices should respond in an acceptable manner to reject SCSI-3 protocol extensions. SCSI-3</p> <p>protocol extensions are designed to be permissive of such rejections and thus allow the SCSI-2</p> <p>devices to continue operation without requiring the use of the extension.</p> <p>The interface protocol includes provision for the connection of multiple initiators (SCSI devices capable of</p> <p>initiating an I/O process) and multiple targets (SCSI devices capable of responding to a request to perform</p> <p>an I/O process). Distributed arbitration (i.e., bus-contention logic) is built into the architecture of SCSI. A</p> <p>default priority system awards interface control to the highest priority SCSI device that is contending for</p> <p>use of the bus and an optional fairness algorithm is defined.</p> <p>This standard defines the physical attributes of an input/output bus for interconnecting computers and</p> <p>peripheral devices.</p> <p>Figure 1 is intended to show the general structure of SCSI standards. The figure is not intended to imply a</p> <p>relationship such as a hierarchy, protocol stack, or system architecture.</p> <p>Common Access Method</p> <p/> <p/> <p/> <p/> <p/> <p> <b>Figure 1 - General Structure of SCSI</b></p> <p>This international standard is intended as an alternate to the SCSI-3 Parallel Interface Standard. This</p> <p>international standard, in addition to containing all the information in the SCSI-3 Parallel Interface Standard</p> <p>contains information and specifications for LVD and fast-40 along with many other improvements.</p>
StatussStandarts spēkā
ICS grupa35.200