SCSI-3 - definition. What is SCSI-3
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%ما هو (من)٪ 1 - تعريف

ORIGINAL SCSI COMPUTER STORAGE BUS
SCSI1; SCSI-1; SCSI-2; SCSI2; SCSI-3; SCSI3; Fast SCSI; Wide SCSI; Ultra SCSI; Narrow SCSI; LVD SCSI; Ultra-160; Ultra SCSI-2; Ultra SCSI-3; Ultra-320; Ultra-640; Fast-320; Differential SCSI; Ultra-3; Ultra-2; SCSI Parallel Interface; Ultra2 SCSI; SCSI terminating resistor; Scsi terminating resistor; Quick arbitration and selection
  • PLCC-84]] package.
  • Amphenol]]-50 SCSI plug
  • PLCC-84]] package

SCSI-3         
<hardware> An ongoing standardisation effort to extend the capabilities of SCSI-2. SCSI-3's goals are more devices on a bus (up to 32); faster data transfer; greater distances between devices (longer cables); more device classes and command sets; structured documentation; and a structured protocol model. In SCSI-2, data transmission is parallel (8, 16 or 32 bit wide). This gets increasingly difficult with higher data rates and longer cables because of varying signal delays on different wires. Furthermore, wiring cost and drive power increases with wider data words and higher speed. This has triggered the move to serial interfacing in SCSI-3. By embedding clock information into a serial data stream signal delay problems are eliminated. Driving a single signal also consumes less driving power and reduces connector cost and size. To allow for backward compatibility and for added flexibility SCSI-3 allows the use of several different transport mechanisms, some serial and some parallel. The software protocol and command set is the same for each transport. This leads to a layered protocol definition similar to definitions found in networking. SCSI-3 is therefore in fact the sum of a number of separate standards which are defined by separate groups. These standards and groups are currently: X3T9.2/91-13R2 SCSI-3 Generic Packetized Protocol X3T9.2/92-141 SCSI-3 Queuing Model X3T9.2/92-079 SCSI-3 Architecture Model IEEE P1394 High Performance Serial Bus X3T9.2/92-106 SCSI-3 Block Commands X3T9.2/91-189 SCSI-3 Serial Bus Protocol X3T9.2/92-105 SCSI-3 SCSI-3 Core Commands SCSI-3 Common Command Set X3T9.2/92-108 SCSI-3 Graphic Commands X3T9.2/92-109 SCSI-3 Medium Changer Commands X3T9.2/91-11 SCSI-3 Interlocked Protocol X3T9.2/91-10 SCSI-3 Parallel Interface X3T9.2/92-107 SCSI-3 Stream Commands SCSI-3 Scanner Commands Additional Documents for the Fibre Channel are also meant to be included in the SCSI-3 framework, i.e.: Fibre Channel SCSI Mapping Fibre Channel Fabric Requirements Fibre Channel Low Cost Topologies X3T9.3/92-007 Fibre Channel Physical and Signalling Interface Fibre Channel Single Byte Commands Fibre Channel Cross Point Switch Topology X3T9.2/92-103 SCSI-3 Fibre Channel Protocol (GPP & SBP) As all of this is an ongoing effort of considerable complexity, document structure and workgroups may change. No final standard is issued yet. In the meantime a group of manufacturers have proposed an extension of SCSI-2 called Ultra-SCSI which doubles the transfer speed of Fast-SCSI to give 20MByte/s on an 8 bit connection and 40MByte/s on a 16-bit connection. [Hermann Strass: "SCSI-Bus erfolgreich anwenden", Franzis-Verlag Muenchen 1993]. (1995-04-19)
Wide SCSI         
<hardware, standard> A variant on the SCSI-2 interface. It uses a 16-bit bus - double the width of the original SCSI-1 - and therefore cannot be connected to a SCSI-1 bus. It supports transfer rates up to 20 MB/s, like Fast SCSI. There is also a SCSI-2 definition of Wide-SCSI with a 32 bit data bus. This allows up to 40 megabytes per second but is very rarely used because it requires a large number of wires (118 wires on two connectors). Thus Wide SCSI usually means 16 bit-wide SCSI. (1995-04-21)
Fast SCSI         
<hardware> A variant on the SCSI-2 bus. It uses the same 8-bit bus as the original SCSI-1 but runs at up to 10MB/s - double the speed of SCSI-1. (1994-11-24)

ويكيبيديا

Parallel SCSI

Parallel SCSI (formally, SCSI Parallel Interface, or SPI) is the earliest of the interface implementations in the SCSI family. SPI is a parallel bus; there is one set of electrical connections stretching from one end of the SCSI bus to the other. A SCSI device attaches to the bus but does not interrupt it. Both ends of the bus must be terminated.

SCSI is a peer-to-peer peripheral interface. Every device attaches to the SCSI bus in a similar manner. Depending on the version, up to 8 or 16 devices can be attached to a single bus. There can be multiple hosts and multiple peripheral devices but there should be at least one host. The SCSI protocol defines communication from host to host, host to a peripheral device, and peripheral device to a peripheral device. The Symbios Logic 53C810 chip is an example of a PCI host interface that can act as a SCSI target.

SCSI-1 and SCSI-2 have the option of parity bit error checking. Starting with SCSI-U160 (part of SCSI-3) all commands and data are error checked by a cyclic redundancy check.