Parallel SCSI - Factbites
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Topic: Parallel SCSI

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 SCSI - Wikipedia, the free encyclopedia
SCSI devices are generally backward-compatible, i.e., it is possible to connect an ultra-3 SCSI hard disk to an ultra-2 SCSI controller and use it (though with reduced speed and feature set).
SCSI stands for "Small Computer System Interface", and is a standard interface and command set for transferring data between devices on a computer bus.
SCSI is most commonly used for hard disks and tape storage devices, but also connects a wide range of other devices, including scanners, CD-ROM drives, CD recorders, and DVD drives. /wiki/SCSI

 SCSI - a definition - see also: skuzzy
A single host adapter, in the form of a PC Card, can serve as a SCSI interface for a laptop, freeing up the parallel and serial ports for use with an external modem and printer while allowing other devices to be used in addition.
The collection of SCSI-3 command sets is used not only for the SCSI-3 parallel interface but for additional parallel and serial protocols, including Fibre Channel, Serial Bus Protocol (used with the IEEE 1394 FireWire physical protocol), and the Serial Storage Protocol (SSP).
Developed at Apple Computer and still used in the Macintosh, the present set of SCSIs are parallel interfaces. /sDefinition/0,,sid5_gci212949,00.html

 SCSI pinouts, SCSI interface, parallel interface, SCSI-1, SCSI-2, SCSI-3
The SCSI interface is a parallel interface, which means the data is not send one bit after another, but several bits over several lines at the same time.
SCSI pinouts, SCSI interface, parallel interface, SCSI-1, SCSI-2, SCSI-3
Because of the definition of SCSI that a job is given by a initiator and then carried out by a target without the initiator knowing how the target is doing it and even not knowing when the job is done the roles of initiator and target may switch. /scsi.html

 Enterprise Design for DAS
SCSI interfaces, with their extended device management capacity, are good mechanisms for accessing external storage cabinets, which offer some performance, availability, and scalability capacity.
SCSI Fast: This standard permits clock speeds of 5-10 MHz but is typically implemented as 10 MHz, which implies a synchronous data transfer rate of 10 MBps on a 1-byte-wide (8-bit) bus and a synchronous data transfer rate of 20 MBps on a 2-byte-wide (16-bit) bus.
SCSI is the most commonly used type of media and protocol for directly attached storage and processors in enterprise class servers. /technet/itsolutions/wssra/raguide/StorageDevices/strgDvcBP_2.mspx

 SCSI Revision Levels
The Fibre Channel interface is completely different from parallel SCSI in that it is a serial interface, meaning command and data information is transmitted on one signal stream organized into packets.
This term refers to the 1 byte wide data bus on a 50-pin parallel interface that is defined in the ANSI standard SCSI-1 (X3.131-1986).
This term usually refers to the 2 byte wide data bus on a 68 pin parallel interface that is defined in the SCSI-3 SPI document. /support/kb/disc/scsirev.html

 Project 1365 - INCITS 362,Information technology -SCSI Parallel Interface-4 (SPI-4)
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:
This standard defines the mechanical, electrical, timing, and protocol requirements of the SCSI parallel interface to allow conforming SCSI devices to inter-operate. /scopes/1365.htm

 High Performance SCSI & RAID: What is SCSI ?
From the parallel side, "Fast-20 Wide" SCSI, also referred to as "Ultra" SCSI, is the technology that SCSI users implement initially.
Interfaces prior to SCSI were not intelligent and were designed for specific devices.
Because it was the first SCSI standard, SCSI-1 had some limitations such as not being as "general-purpose" and fast as it needed to be. /~neuffer/scsi/what_is_scsi.html

All PnP SCSI devices are required to use drivers and receivers which meet the specifications defined in single-ended alternative of the SCSI-3 Parallel Interface.
PnP SCSI peripheral subsystems attached to the SCSI bus shall be terminated by installing an external terminator into the remaining open connector on the last peripheral subsystem on the bus.
The SCSI bus internal to the enclosure is routed from one external SCSI connector to the SCSI device(s) within the enclosure and then to the second external SCSI device connector. /afs/sipb/contrib/doc/PnP/pnpscsi.doc

 SCSI Glossary: Practical Definitions and Terminologies for SCSI
SCSI messages are used during the command transfer to negotiate the fast and wide transfer options for the data transfer.
The SCSI command and data phases are reduced from a seven to a three phase process and then further combines the status phase and message phase that occur after a data transfer.
A result of the "intelligence" of SCSI that allows a device to disconnect from the bus while it is performing a task, such as locating some information at a specific address, and, once it has located the information, reconnect to the bus in order to complete its task. /glos.html

 SCSI (Small Computer System Interface) (Linktionary term)
All commands and data cross the SCSI shared bus, which is a parallel interface.
SCSI (pronounced "scuzzy") is a family of disk interface systems that provide access services for peripheral I/O devices such as disk drives, CD-ROM discs, optical disks, tape drives, scanners, and other devices.
SCSI is normally implemented in host adapters, which provides a shared bus to which peripheral devices attach. /s/scsi.html

 SCSI Interface
Each spec is built upon the SCSI Parallel Interface (SPI), which defines the way in which SCSI devices communicate with each other.
SCSI is a relatively easy thing to implement, should you wish to.
The end result is that each piece of SCSI hardware has its own host adapter, and the software drivers for the device cannot work with an adapter made by someone else. /show/harddrive/153

 SPI - Scsi Parallel Interface, Security Parameter Index, Serial Peripheral Interface, Service Provider Interface, Smart Plug-In, Stateful Packet Inspection, Stream Programming Interface, System Packet Interface
SCSI Parallel Interconnect, parallel data cabling to connect up to 15 devices to a host computer over a relatively short distances for which there a number of different speeds and even signaling methods with differing restrictions.
Scsi Parallel Interface is not the only word formed from SPI.
A Service Provider Interface specifies the interface a software component should implement if it wants to provide a certain service (conform to a certain standard, which the SPI is part of). /acronym/SPI.asp

 MerchantStore - Directory of SCSI Device Resources
SCSI Positioning Paper SCSI is seen as the total solution and will maintain its position as the I/O technology of choice for future enterprise computing, Internet computing and desktop applications, interesting article from the STA.
Expanding the SCSI Bus SCSI interface is projected by most industry analysts to maintain its hold on the mass storage market through the year 2005.
SCSI Common Codes and Values Informative summaries for several of the more commonly used codes and coded values are included as annex information in the SCSI Primary Commands - 2 draft standard. /computer/scsi.html

 LVD - Ultra2 SCSI Low Voltage Differential Drives
LVD also provides for easy integration of up to 16 devices on the SCSI bus using 12 meters of cable, providing the data integrity of differential at approximately the same cost as the older single-ended designs and the parallel SCSI bus performance needed for Seagate’s high-performance Barracuda and Cheetah drive families.
A unique DiffSens circuit determines the type of SCSI bus the device is being used on, LVD or single-ended, and configures the drive operation to the appropriate bus capability, otherwise known as multi-moding.
This is a dramatic increase from Ultra SCSI single-ended cable restrictions of 3 meters and maximum burst transfer rates of 40 Mbytes/sec. /support/kb/disc/ultra2_scsi_lvd.html

 SCSI(-3) Parallel Interface - 3 (SPI-3)
The third generation of the SCSI parallel interface is, unsurprisingly, called the SCSI(-3) Parallel Interface - 3 or SPI-3.
SPI-3 also does some "cleanup" of the parallel SCSI standard, by making obsolete several older features that either never caught on in the industry, or were replaced with superior ways of accomplishing the same tasks:
In doing so, the SCSI world was mercifully rid of one of the worst acronyms in the history of the computer industry. /guide2000/ref/hdd/if/scsi/std/scsi3SPI3.html

 SCSI(-3) Parallel Interface (SPI)
Protocol: The protocol for parallel SCSI was defined in a document entitled SCSI-3 Interlocked Protocol (SIP).
Physical Layer: The physical layer was defined in the SCSI-3 Parallel Interface or SPI document, ANSI standard X3.253-1995.
Since "regular SCSI" uses a parallel bus (many wires transferring data in parallel), this technology became known as the SCSI-3 Parallel Interface or SPI. /guide2000/ref/hdd/if/scsi/std/scsi3SPI.html

 Disk I/O Tuning SCSI Interfaces Small Computer System Interface Block Primary Commands ANSI Interlocked Protocol Parallel Interface Fibre Channel Protocol
It is the job of the SCSI controller to handle the appropriate protocol path -- SCSI Interlocked Protocol serving the more common, SCSI Parallel interface, and SCSI Fibre Channel Protocol handling Fibre Channel requests.
Prior to SCSI-3, the protocol would have tied directly to the SCSI Parallel Interface.
Disk I/O Tuning SCSI Interfaces Small Computer System Interface Block Primary Commands ANSI Interlocked Protocol Parallel Interface Fibre Channel Protocol /disk_32.htm

 SCSI(-3) Parallel Interface - 2 (SPI-2)
The second generation of the SCSI-3 parallel interface standard is called the SCSI(-3) Parallel Interface - 2, or SPI-2.
SPI-2 formally replaced the earlier collection of SPI documents in 1999, and in doing so simplified matters significantly, since at least now everything associated with parallel SCSI was back in one document.
LVD (or the older HVD) is required to run the SCSI bus at Fast-40 speeds; you can read more about it here. /guide2000/ref/hdd/if/scsi/std/scsi3SPI2.html

 Expanding the SCSI bus
The parallel SCSI interface has increased in speed while using the same physical transmission mediums defined when the bus was more than 10 times slower.
Parallel SCSI Expanders used as extenders separate a SCSI bus (SCSI domain) into more than one physical segment, each of which can have the full SCSI cable length for that type.
The SCSI Trade Association ( has a link to the X3T10 web site which contains this document available for viewing, along with other information about the parallel SCSI interface. /scsi

 Ultra320 SCSI
LVD (Low Voltage Differential) SCSI is required SCSI SPI-4 for Fast-160DT.
16 bit SCSI packetized commands with Synchronous data transfer rates up to 320 megabytes per second.
A new data transfer mode is required, with an 80 MHz free running clock to eliminate ISI problems with the clock signal, P1 gating signal is clocked with the free running clock for a valid transfer. /terms/Ultra320_SCSI.html

 SCSI Book Contains Information on all SCSI Applications. Making SCSI Work: A Practical Guide
For those who want common-sense information on using SCSI to satisfy the data communication requirements of today and the future.
SCSI Book Contains Information on all SCSI Applications.
Read an Excerpt from the book on LVD SCSI or on Cable Cautions. /mscsiwork.html

 SCSI Architecture
It is a single standard containing all SCSI architecture layers for only the parallel interface.
Subsequent SCSI standards have dropped the '-3' from their names because it was cumbersome.
While the individual components of the SCSI family continue to evolve, there is no SCSI-4 project envisioned. /scsi-3.htm

 SoC controls broadband passive optical networking: News from Freescale Semiconductor
parallel interface (SPI), an interrupt controller, general-purpose input output (GPIO), and ATM adaptation layer 5 (AAL5) support.
The B-PON interface fully complies with the ITU-T G.983 specification, which is critical for PON system interoperability used in FTTx network deployments.
The B-PON layer termination core is based on Freescale's discrete MC92701 interface device. /news/mot/mot188.html

 Parallel to SCSI Interface
Converts the parallel port into a true SCSI interface in seconds.
Fast installation adds full SCSI flexibility to your notebook, laptop, or desktop PC without the hassle of plug in host adapters.
Allows you to add the flexibility of SCSI capability without the hassle of installing a SCSI card. /reader/scsiadapter.htm

 T13 Technical Committee - AT Attachment
Technical Committee T13 is responsible for all interface standards relating to the popular AT Attachment (ATA) storage interface utilized as the disk drive interface on most personal and mobile computers today.
This firmware interface builds on ATA/ATAPI-4 (NCITS 317-1998) to provide services that an operating system may use to access the hidden area in the same manner as a removable media device.
Different types of host adapters, methods for their identification, and the programming interfaces used are defined.

 Dan Kegel's Fast Hard Drives Page
SCSI Trade Association -- Dedicated to promoting the understanding and use of SCSI Parallel Interface Technology.
EE Times: SCSI: the SCA2 connecter standard -- Single Connector Attachment; allows hot-plugging; useful for racks of slide-in SCSI drives.
The Birth of a Standard: How the Ultra-SCSI Standard Came to Be /drives

 SCSI Terminologies: Quick List
Note: This is a reference list of terms defined in Paralan's SCSI Glossary.
Click on a term to take you back to the definition. /gloswdlist.html

 SCSI Parallel Interface, SPI
El Interfaz SCSI que teníamos en las versiones anteriores de SCSI es lo que, bajo el estándar SCSI-3, se conoce como SPI (SCSI Parallel Interface) en sus diferentes versiones que veremos a continuación. /documentos/scsi/node13.html

 HP Scanners: 88396 SCSI/PARALLEL INTERFACE Drivers
I have "inherited" an HP 88396 SCSI/PARALLEL Interface
I would like to use this with my other SCSI devices on a Win 98 and/or NT4 machine.
Get instant answers from Experts Exchange knowledge base /Q_10340146.html

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