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Topic: SCSI Parallel Interface


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  SCSI - Wikipedia, the free encyclopedia
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.
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).
en.wikipedia.org /wiki/SCSI   (1581 words)

  
 SCSI - a Whatis.com definition - see also: skuzzy   (Site not responding. Last check: 2007-11-03)
SCSI allows up to 7 or 15 devices (depending on the bus width) to be connected to a single SCSI port in daisy-chain fashion.
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 latest SCSI standard is Ultra-3 (sometimes spelled "Ultra3")which increases the maximum burst rate from 80 Mbps to 160 Mbps by being able to operate at the full clock rate rather than the half-clock rate of Ultra-2.
searchstorage.techtarget.com /sDefinition/0,,sid5_gci212949,00.html   (628 words)

  
 Enterprise Design for DAS
SCSI is the most commonly used type of media and protocol for directly attached storage and processors in enterprise class servers.
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.
www.microsoft.com /technet/itsolutions/wssra/raguide/StorageDevices/strgDvcBP_2.mspx   (3005 words)

  
 [No title]
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.
www.mit.edu /afs/sipb/contrib/doc/PnP/pnpscsi.doc   (4885 words)

  
 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.
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.
In SCSI there is also active termination, which means the termination is done by a voltage regulator and some resitors.
www.connectworld.net /scsi.html   (573 words)

  
 MerchantStore - Directory of SCSI Device Resources   (Site not responding. Last check: 2007-11-03)
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.
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.
www.merchantstore.com /computer/scsi.html   (1088 words)

  
 SCSI Glossary: Practical Definitions and Terminologies for SCSI
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.
SCSI messages are used during the command transfer to negotiate the fast and wide transfer options for the data transfer.
A result of the "intelligence" of SCSI that allows an initiator or target 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.
www.paralan.com /glos.html   (7502 words)

  
 SCSI Revision Levels
For example, a comparable set of standards for a SCSI Fiber Channel interface disc drive replaces the physical and protocol layers with new documents but uses the same documents for the other 3 layers.
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 is a Seagate specific term describing the basic structure of the SCSI firmware included with a Seagate disc drive and standing for Advanced SCSI Architecture, generation 2.
www.seagate.com /support/kb/disc/scsirev.html   (1543 words)

  
 SCSI Interface   (Site not responding. Last check: 2007-11-03)
SCSI is an entirely different interface than the more popular IDE.
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.
SCSI is a relatively easy thing to implement, should you wish to.
www.pcmech.com /show/harddrive/153   (757 words)

  
 High Performance SCSI & RAID: What is SCSI ?
Interfaces prior to SCSI were not intelligent and were designed for specific devices.
Thus there was a hard disk interface for a hard drive, a tape drive interface for a tape drive, and so on.
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.
www.uni-mainz.de /~neuffer/scsi/what_is_scsi.html   (1288 words)

  
 Project 1525- INCITS 367, Information technology, SCSI Parallel Interface - 5 (SPI-5)   (Site not responding. Last check: 2007-11-03)
interface to allow conforming SCSI devices to inter-operate.
The SCSI parallel interface is a local I/O bus
The objectives of the SCSI parallel interface are:
www.ncits.org /scopes/1525.htm   (192 words)

  
 SCSI (Small Computer System Interface) (Linktionary term)
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.
Ultra3 SCSI adds features such as the ability to choose the highest possible data transfer rate; packetization (transfer multiple commands and messages at once); and QAS (quick arbitrate and select), which provides faster arbitration to reduce connect/disconnect on the bus.
www.linktionary.com /s/scsi.html   (1200 words)

  
 SPI - Scsi Parallel Interface, Security Parameter Index, Serial Peripheral Interface, Service Provider Interface, Smart ...
Scsi Parallel Interface is not the only word formed from SPI.
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.
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).
www.auditmypc.com /acronym/SPI.asp   (633 words)

  
 Expanding the SCSI bus
The SCSI interface is projected by most industry analysts to maintain its hold on the mass storage market through the year 2005.
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.
www.shiloff.org /scsi   (1603 words)

  
 SCSI(-3) Parallel Interface (SPI)
The first description of the parallel interface was accomplished in a rather confusing way, through the use of three different documents (see this page for more details on the standards documents):
Protocol: The protocol for parallel SCSI was defined in a document entitled SCSI-3 Interlocked Protocol (SIP).
Taken collectively, these are sometimes called Ultra SCSI or Wide Ultra SCSI, which are really informal or marketing terms; sometimes, Ultra SCSI refers specifically to the faster signaling rates themselves.
www.storagereview.com /guide2000/ref/hdd/if/scsi/std/scsi3SPI.html   (317 words)

  
 LVD - Ultra2 SCSI Low Voltage Differential Drives   (Site not responding. Last check: 2007-11-03)
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.
This is a dramatic increase from Ultra SCSI single-ended cable restrictions of 3 meters and maximum burst transfer rates of 40 Mbytes/sec.
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.
www.seagate.com /support/kb/disc/ultra2_scsi_lvd.html   (1047 words)

  
 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.
LVD is an attempt to blend the best attributes of conventional single-ended (SE) signaling and the older type of differential signaling that is now called high voltage differential (HVD).
LVD (or the older HVD) is required to run the SCSI bus at Fast-40 speeds; you can read more about it here.
www.storagereview.com /guide2000/ref/hdd/if/scsi/std/scsi3SPI2.html   (381 words)

  
 SCSI bus and interface
The goal of the effort was to develop an interface that supported logical block addressing rather than head/cylinder/sector, 8-bit parallel data transfer instead of analog serial and generic commands rather than a couple of control lines.
SCSI Termination Tutorial Written to help users understand common field issues that one might run into when connecting a SCSI drive (or drives) to various kinds of SCSI buses, whether cable or backplane.
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 (SPC-2) draft standard.
www.scsilibrary.com /bus.html   (742 words)

  
 Project 1365 - INCITS 362,Information technology -SCSI Parallel Interface-4 (SPI-4)   (Site not responding. Last check: 2007-11-03)
This standard defines the mechanical, electrical, timing, and protocol requirements of the SCSI parallel interface to allow conforming SCSI devices to inter-operate.
The SCSI parallel interface is a local I/O bus that may be operated over a wide range of transfer rates.
Thus, different disk drives, tape drives, printers, optical media drives, and other SCSI devices may be added to the host computers without requiring modifications to generic system hardware.
www.ncits.org /scopes/1365.htm   (200 words)

  
 SCSI Terms & Terminology   (Site not responding. Last check: 2007-11-03)
STA-Endorsed Terms & Terminology for SCSI Parallel Interface Technology
(3) LVD was not defined in the original SCSI standards for this speed.
SCSI Terms - STA overview of the different SCSI Standards and Cables.
www.scsita.org /terms/scsiterms.html   (133 words)

  
 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.
www.storagereview.com /guide2000/ref/hdd/if/scsi/std/scsi3SPI3.html   (612 words)

  
 Disk I/O Tuning SCSI Interfaces Small Computer System Interface Block Primary Commands ANSI Interlocked Protocol ...   (Site not responding. Last check: 2007-11-03)
The SCSI Primary Commands (SPC) set sits over these more base commands, providing the basis for SCSI interoperability--therefore, per the SCSI-3 specification, all SCSI devices must support SPC, otherwise the dream of true interoperability is not possible.
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.
SCSI 3 is the latest commonly available implementation of SCSI, let's examine it in more detail.
www.praetoriate.com /disk_32.htm   (329 words)

  
 Harddisk Interface Types (SCSI / IDE)   (Site not responding. Last check: 2007-11-03)
SCA-2 is a miniature D style, 80 pin connector used on SCSI drives to plug to backplane connections.
The SCA-2 connector provides grounds, voltage, and control lines needed to allow hot-plugging of parallel interface SCSI drives.
Seagate designates an SCA-2 SCSI interface with a "c" in the model number.
www.rackmount.com /RAID/HD_Interface.htm   (59 words)

  
 Open Directory - Computers: Hardware: Buses: SCSI   (Site not responding. Last check: 2007-11-03)
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 (SPC-2) draft standard.
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.
dmoz.org /Computers/Hardware/Buses/SCSI   (583 words)

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