USER’S GUIDE LSIU80ALVD PCI to Ultra2 SCSI Host Adapter August 2004 Version 2.
Electromagnetic Compatibility Notices This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. 2. This device may not cause harmful interference, and This device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
This document contains proprietary information of LSI Logic Corporation. The information contained herein is not to be used by or disclosed to third parties without the express written permission of an officer of LSI Logic Corporation. LSI Logic products are not intended for use in life-support appliances, devices, or systems. Use of any LSI Logic product in such applications without written consent of the appropriate LSI Logic officer is prohibited.
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Preface This book is the primary reference and user’s guide for the LSIU80ALVD PCI to Ultra2 SCSI Host Adapter. It contains a complete functional description for the LSIU80ALVD and includes complete physical and electrical specifications for the LSIU80ALVD. Audience This document assumes that you have some familiarity with microprocessors and related support devices.
Related Publications PCI Storage Device Management System SDMS™ 4.0 User’s Guide, Document DB15-000099-01 Revision Record Revision Date Remarks 2.0 8/04 Final version. First printing.
Contents Chapter 1 Using the LSIU80ALVD 1.1 General Description 1.2 Features 1.2.1 PCI Interface 1.2.2 SCSI Interface 1.2.3 Board Characteristics 1.3 Interface Descriptions 1.3.1 The PCI Interface 1.3.2 The SCSI Interface 1.3.3 Ultra2 SCSI Technology 1.3.4 LVDlink Technology 1.3.5 On-Board LED Chapter 2 Installing the LSIU80ALVD 2.1 Quick Installation Procedure 2.2 Detailed Installation Procedure 2.2.1 Before You Start 2.2.2 Inserting the Host Adapter 2.2.3 Connecting the SCSI Peripherals 2.2.
Chapter 3 Configuring the LSIU80ALVD 3.1 When to Configure the LSIU80ALVD 3.2 Starting the SCSI BIOS Configuration Utility 3.2.1 Configuration Utility Main Menu 3.2.2 Utilities Menu 3.2.3 Device Selections Menu 3.3 Exiting the SCSI BIOS Configuration Utility 3-1 3-2 3-3 3-7 3-11 3-14 Appendix A Technical Specifications A.1 Physical Environment A.1.1 Physical Characteristics A.1.2 Electrical Characteristics A.1.3 Thermal, Atmospheric Characteristics A.1.4 Electromagnetic Compliance A.1.
Figures 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 3.1 3.2 3.3 3.4 3.5 3.6 3.7 A.
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Tables 2.1 2.2 2.3 3.1 3.2 A.1 A.2 A.3 A.4 A.5 A.
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Chapter 1 Using the LSIU80ALVD This chapter describes the LSIU80ALVD PCI to Ultra2 SCSI Host Adapter board interface to PCI computer systems and includes these topics: 1.1 • Section 1.1, “General Description,” page 1-1 • Section 1.2, “Features,” page 1-2 • Section 1.3, “Interface Descriptions,” page 1-3 General Description The LSIU80ALVD provides an Ultra2 SCSI interface to PCI computer systems. It will be referred to as the LSIU80ALVD throughout this manual.
1.2 Features This section provides a high level overview of the PCI Interface, the SCSI Interface, and Board Characteristics for the LSIU80ALVD. 1.2.1 1.2.2 1-2 PCI Interface • Full 32-bit DMA bus master • Zero wait-state bus master data bursts up to 133 Mbytes/s (@ 33 MHz) • Universal 3.
1.2.3 • Performs complex SCSI bus sequences without interrupts, including restore data pointers • Serial EEPROM for user configuration utility • SCSI bus activity LED connector and on-board LED Board Characteristics • PCI board dimensions, 152.4 x 88.90 mm (6.00 x 3.
1.3.2 The SCSI Interface The SCSI functionality for the LSIU80ALVD is contained within the LSI53C895A. The LSI53C895A connects directly to the SCSI bus and generates signal timing and bus protocol in compliance with the SCSI standard. The SCSI interface on the LSIU80ALVD operates as an 8-bit or 16-bit interface. It supports 8-bit or 16-bit, synchronous and asynchronous, LVD or SE, Fast, Ultra and Ultra2 SCSI protocols in various combinations.
1.3.3 Ultra2 SCSI Technology The LSIU80ALVD fully supports Ultra2 SCSI. Ultra2 SCSI is an extension of the SCSI Parallel Interface 2 and 3 (SPI-2 and SPI-3) family of standards that expands the bandwidth of the SCSI bus, allowing faster synchronous data transfers. For the internal bus, special impedance SCSI ribbon cables are specified for operation with Ultra and Ultra2 SCSI devices. You must consider the total length of the bus cables and the number of devices on the SCSI bus when setting up your system.
1.3.4.1 Benefits of LVDlink The LSI53C895A supports LVD for SCSI, which is a signaling technology that increases the reliability of SCSI data transfers over longer distances than supported by SE SCSI. The low current output of LVD allows the I/O transceivers to be integrated directly into the chip. LVD provides the reliability of HVD SCSI without the added cost of external differential transceivers.
Chapter 2 Installing the LSIU80ALVD This chapter provides instructions on how to install the LSIU80ALVD and includes these topics: 2.1 • Section 2.1, “Quick Installation Procedure,” page 2-1 • Section 2.2, “Detailed Installation Procedure,” page 2-3 • Section 2.3, “Completing the Installation,” page 2-24 Quick Installation Procedure This section is provided for the experienced computer user with prior host adapter installation and SCSI bus setup experience.
Step 4. Locate the slots for installing a PCI plug-in board. The LSIU80ALVD requires a PCI slot that allows bus master operation. See Table 2.2. Step 5. Remove the blank bracket panel on the back of the computer aligned with the PCI slot you intend to use. Save the bracket screw. Step 6. Carefully insert the edge connector J1 of the host adapter into the PCI slot. Make sure the edge connector is properly aligned before pressing the board into place. See Figure 2.2.
2.2 Detailed Installation Procedure This section provides step-by-step instructions for installing the LSIU80ALVD, and connecting it to your SCSI peripherals. If you are experienced in these tasks, you may prefer to use the preceding Section 2.1, “Quick Installation Procedure.” If you are not confident you can perform the tasks as described here, LSI Logic suggests getting assistance. 2.2.
2.2.2 Inserting the Host Adapter For safe and proper installation, check the user’s manual supplied with your computer and perform the following steps. Step 1. Ground yourself before removing this host adapter board. Remove the LSIU80ALVD from the packing and check that it is not damaged. An example of this host adapter board is shown in Figure 2.1. Step 2. Switch off and unplug power cords for all components in your system. Step 3. Remove the cabinet cover from your computer to access the PCI slots.
Figure 2.1 Hardware Connections for the LSIU80ALVD LED Connector J4 Internal SCSI Interface J2 External SCSI Interface J3 LSIU80ALVD J1 to PCI Mainboard Step 6. Carefully insert edge connector J1 (see Figure 2.1) of the host adapter into the PCI slot. Make sure the edge connector is properly aligned before pressing the board into place as shown in Figure 2.2. Note: You may notice that the components on the PCI host adapter face the opposite way from non-PCI adapter boards you have in your system.
Figure 2.2 Inserting the Host Adapter Bracket Screw Press Here Press Here Step 7. 2-6 The bracket around connector J3 (see Figure 2.1) should fit where you removed the blank panel. Secure it with the bracket screw (see Figure 2.2) before making the internal and external SCSI bus connections.
2.2.3 Connecting the SCSI Peripherals SCSI bus connections to the LSIU80ALVD inside your computer can be made with an unshielded 68-conductor Ultra SCSI PVC ribbon cable (see Figure 2.3). One side of this cable is marked with a colored stripe to indicate pin 1. Sometimes the connectors on this cable are keyed to ensure proper pin-1 connection. All external SCSI bus connections to the LSIU80ALVD are made with high quality shielded 68-conductor cables (see Figure 2.3).
You can connect up to four devices if they are evenly spaced on a 3-meter Ultra SCSI cable (0.75 m between devices). Your SE SCSI bus should not exceed 3 meters (total internal and external cable lengths), even with fewer than four devices. For LVD applications, you can connect up to 16 devices including the host adapter if they are evenly spaced on a 12-meter Ultra SCSI cable (0.19 m minimum between devices). Table 2.
Figure 2.
2.2.4 Making Internal SCSI Bus Connections This section provides step-by-step instructions about making internal SCSI bus connections. Step 1. To connect an internal SCSI device, plug the 68-pin connector on one end of the internal SCSI ribbon cable into connector J2 (see Figure 2.4). Figure 2.
Step 2. Plug the 68-pin connector on the other end of the internal SCSI ribbon cable into the SCSI connector on your internal SCSI device. An example of this connection is shown in Figure 2.5. You must match pin 1 on all connections. Note: Figure 2.5 For nonterminated internal SCSI devices, a terminated cable will be required. This connector must be on the end of the SCSI cable.
Step 3. To plug in additional internal SCSI devices, use an internal SCSI ribbon cable with the required number of 68-pin connectors attached along its length as shown in Figure 2.6. An example of this type of chained connection is shown in Figure 2.7. Make sure to match pin 1 on all connections. Figure 2.
Figure 2.
Most PC cabinets are designed with a front panel LED. You may connect the LED cable to connector J4 on the host adapter, as shown in Figure 2.8. This causes the front panel LED to light when there is activity on the SCSI bus. Connector J4 is not keyed. The orientation of the LED cable does not matter as long as all four pins are connected. Figure 2.8 SCSI LED Connector LED Connector J4 Some LED cables have only two wires. In this case, place the connector on one end or the other of J4.
2.2.5 Making External SCSI Bus Connections This section provides step-by-step instructions about making external SCSI bus connections. Step 1. To connect external SCSI devices to the LSIU80ALVD, plug the 68-pin HD connector on one end of a shielded external SCSI cable (see Figure 2.3) into the host adapter connector J3 (see Figure 2.1). This connector is in the bracket attached to the back panel of your computer. Figure 2.9 shows how this connection is made. Figure 2.
Step 2. Plug the 68-pin connector on the other end of the shielded external SCSI cable into the SCSI connector on your external SCSI device. An example of this connection is shown in Figure 2.10. Figure 2.
Step 3. To connect more than one external SCSI device to the host adapter, you must chain them together with shielded external SCSI cables. An example of these chained connections is shown in Figure 2.11. Figure 2.
2.2.6 SCSI Bus Termination The devices making up the SCSI bus are connected serially (chained together) with SCSI cables. The first and last physical SCSI devices connected on the ends of the SCSI bus must have their terminators active. All other SCSI devices on the bus must have their terminators removed or disabled. Remember that the LSIU80ALVD is also on the SCSI bus—its termination is automatically enabled when it is connected to the end of the bus.
2.2.7 Internal Bus Connections If you have only internal SCSI device connections to your host adapter, you must terminate the last internal device on the SCSI bus. You must disable the terminators on all other devices. Termination on your host adapter is automatically enabled in this case. Figure 2.12 shows an example of how termination is determined for this SCSI bus configuration. Figure 2.
2.2.8 External Bus Connections If you have only external SCSI device connections to your host adapter, you must terminate the last external device on the SCSI bus. You must disable the terminators on all other devices. Termination on the host adapter is automatically enabled in this case. Figure 2.13 shows an example of how termination is determined for this SCSI bus configuration. Figure 2.
2.2.9 Internal and External Bus Connections If internal and external SCSI device connections to your host adapter have been made, then terminate the last internal and last external devices on the SCSI bus. You must disable the termination on all other devices. Termination on the host adapter is automatically disabled in this case. Figure 2.14 shows an example of how termination is determined for this SCSI bus configuration. Figure 2.
2.2.10 Setting SCSI IDs You must set each SCSI device and the host adapter to a separate SCSI ID 0 through 15. SCSI ID 7 is the preset host adapter setting, giving it the highest priority on the SCSI bus. If you plan to boot your computer from a SCSI hard disk drive on the SCSI bus, that drive should have the lowest SCSI ID on the bus. Typically, SCSI ID 0 is used; however, for system performance optimization, an ID other than 0 (zero) can be used.
Table 2.
2.3 Completing the Installation Before replacing the cover on your computer, review this installation procedure check list. This can save you effort later. Verify Installation Procedures Done Host adapter connection in PCI bus slot secure Internal SCSI bus connections secure (pin-1 continuity) External SCSI bus connections secure Proper SCSI bus termination established Unique SCSI IDs set and recorded for each device 2-24 Step 1. Replace the cabinet cover on your computer. Step 2.
Chapter 3 Configuring the LSIU80ALVD This chapter describes configuring the LSIU80ALVD and includes these topics: 3.1 • Section 3.1, “When to Configure the LSIU80ALVD,” page 3-1 • Section 3.2, “Starting the SCSI BIOS Configuration Utility,” page 3-2 • Section 3.3, “Exiting the SCSI BIOS Configuration Utility,” page 3-14 When to Configure the LSIU80ALVD In most cases you should not need to change the default configuration of the host adapter.
Table 3.2 Device Default Settings Settings for Individual SCSI Devices Default Settings Synchronous Transfer Rate (Mbytes/s) 80 Data Width 16 Disconnect On Read Write I/O Time-out (seconds) 10 Scan for Devices at Boot Time Yes Scan for SCSI LUNs1 Yes Queue Tags On 1. Logical Unit Number. 3.2 Starting the SCSI BIOS Configuration Utility If you have LSI Logic SCSI BIOS Version 4.
NonVolatile Random Access Memory (NVRAM) is available on the LSIU80ALVD. Changes can be made and stored using this menu driven utility. 3.2.1 Important: This utility is a powerful tool. If, while using it, you somehow disable all of your controllers, pressing Ctrl-A (or Ctrl-E on version 4.04 or later) after memory initialization during reboot allows you to re-enable and reconfigure. Note: Not all devices detected by the Configuration Utility can be controlled by the BIOS.
Figure 3.1 Main Menu Main Menu Port Num LSI53C895A FC00 LSI53C896 F800 LSI53C896 F801 Irq---------Status--------NVRAM Level Current Next-Boot Found 9 9 9 On On On On Off Off Yes Yes Yes Change Adapter Status Adapter Boot Order Additional Adapter Configuration Display Mode = Verbose Mono/Color Language Help Quit Below the list of host adapters on the Main Menu display, you see eight options. They are described in detail below.
Figure 3.2 Change Status on Next Boot Menu Main Menu Change Status on Next Boot: Port Num LSI53C895A FC00 LSI53C896 F800 LSI53C896 F801 Irq---------Status--------NVRAM Level Current Next-Boot Found 9 9 9 On On On On Off Off Yes Yes Yes To change an adapter's status, select it and press Enter. Then press the Escape (Esc) key to exit from this menu. 3.2.1.
3.2.1.3 Additional Adapter Configuration Additional Adapter Configuration allows the user to configure an adapter that is not assigned a boot order. When this option is selected, the Adapter Configuration menu (as shown in Figure 3.4) appears: Figure 3.4 Adapter Configuration Menu Main Menu BootSeq 1 Bus LSI53C895A 00 DevFunc BootSeq A0 0 LSI53C896 Bus DevFunc 00 98 LSI53C896 Highlight the adapter to be configured and press Enter.
3.2.1.7 Help The Help option displays a help screen with information about the Main Menu. 3.2.1.8 Quit The Quit option allows exiting from the SCSI BIOS Configuration Utility when the Main Menu is displayed. 3.2.1.9 Esc Pressing the Esc key allows exiting from all the screens except the Main Menu. 3.2.2 Utilities Menu When you select a host adapter on the Main menu, the Utilities menu appears. Figure 3.5 is an example of the Utilities menu: Figure 3.
Figure 3.6 Adapter Setup Menu Adapter Setup SCAM Support Off Parity Enabled Host SCSI ID 7 Scan Order Low to High <0..Max> Removable Media Support None CHS Mapping SCSI Plug & Play Mapping Spinup Delay 2 Secondary Cluster Server No Termination Help Restore Default Setup Exit this menu The settings in this menu are global settings that affect the selected host adapter and all SCSI devices attached to it. SCAM Support – The LSI Logic BIOS Version 4.
Host SCSI ID – This option refers to the host adapter’s SCSI ID, which is a unique number used to identify the device on the SCSI bus. Note: In general, it is suggested that you do not change your host adapter ID from the default value of 7, as this gives it the highest priority on the SCSI bus. Scan Order – This option allows the user to tell the SCSI BIOS and device drivers to scan the SCSI bus from low to high (0 to max) SCSI ID, or from high to low (max to 0) SCSI ID.
CHS Mapping – This option defines the cylinder head sector (CHS) values that will be mapped onto a disk without pre-existing partitioning information. SCSI Plug and Play Mapping is the default value. To support interchange with non-compatible systems, there is another option that can be selected by choosing CHS Mapping and then moving the cursor to Alternate CHS Mapping. Note: Neither of these options will have any affect after the disk has been partitioned with the FDISK command.
3.2.3 Device Selections Menu When you select the Device Selections option, the corresponding menu appears. Figure 3.7 is an example of the Device Selections menu: Figure 3.
Figure 3.7 Device Selections Menu (Cont.) LSI53C895A Sync Rate Width Disconnect Read/Write I/O Timeout Scan for Device at Boot Time Scan for SCSI LUNs Queue Tags Initial Boot Format Verify Help Restore Default Setup Exit this menu Sync Rate (Mbytes/s) – This option defines the maximum data transfer rate the host adapter will attempt to negotiate. The host adapter and a SCSI device must agree to a rate they can both handle.
Read/Write I/O Time-Out (seconds) – This option sets the amount of time the host adapter waits for a read, write, or seek command to complete before trying the I/O transfer again. Since this provides a safeguard allowing the system to recover if an I/O operation fails, it is recommended that you always set the time-out to a value greater than zero. Note: If the time-out is set to zero, then the I/O will never time-out.
Restore Default Setup – This option resets all device selections back to their optimal settings. Select this option to restore all manufacturing defaults for the specified adapter. Note that all user customized options will be lost upon saving after restoring default setup. Exit this menu – This option allows the user to leave the current menu screen and return to the previous screen. 3.
Appendix A Technical Specifications The section discusses the physical environment associated with the LSIU80ALVD. It includes a mechanical drawing of this board, which is shown in Figure A.1. It also includes these topics: A.1 • Section A.1, “Physical Environment,” page A-1 • Section A.2, “Operational Environment,” page A-4 Physical Environment This section discusses the physical, electrical, thermal, and safety characteristics of the LSIU80ALVD.
Figure A.1 LSIU80ALVD Mechanical Drawing U1 VR1 J4 SCSI LVD/SE U3 LSIU80ALVD U13 +3.3 V CT6 U7 L1 U5 CT5 CT7 L2 U12 1998 U6 U11 U10 U9 CT8 CT9 J3 U8 C Note: • J1: • J2: • J3: • J4: U2 SIG2_A 5V_A GND_A ICT SIG1_A 6.533’’ CT4 J2 U4 88.990 mm (3.5 inches) SCSI LVD/SE CT3 TERM CT2 CR2 CR3 CR1 Activity F1 CT1 152.4 mm (6.0 inches) CT10 5V_B GND_B J1T SIG2_B SIG1_B 62 01 PCI 32-bit, universal board connector. 68-pin high density connector. 68-pin high density connector.
The PCI PRSNT1/ and PRSNT2/ pins are set to indicate a 7.5 W maximum configuration. A.1.3 Thermal, Atmospheric Characteristics The board is designed to operate in an environment defined by the following parameters: A.1.
A.2 Operational Environment The LSIU80ALVD is designed for use in PCI computer systems. The SDMS operates the board, but the design of the board does not prevent the use of other software. A.2.1 The PCI Interface The PCI interface operates as a 32-bit DMA bus master. The connection is made through edge connector J1, which provides connections on both the front and back of the board. The signal definitions and pin numbers conform to the PCI Local Bus Specification Revision 2.1 standard. Table A.
Table A.2 PCI Connector J1 (Front) Signal Name Pin Signal Name Pin Signal Name Pin −12 V 1 GND 22 SERR/ 42 TCK 2 AD27 23 +3.3 V 43 GND 3 AD25 24 C_BE1/ 44 TDO 4 +3.3 V 25 AD14 45 +5 V 5 C_BE3/ 26 GND 46 +5 V 6 AD23 27 AD12 47 INTB/ 7 GND 28 AD10 48 INTD/ 8 AD21 29 GND 49 GND (PRSNT1/) 9 AD19 30 KEYWAY 50 RESERVED 10 +3.3 V 31 KEYWAY 51 GND (PRSNT2/) 11 AD17 32 AD08 52 KEYWAY 12 C_BE2/ 33 AD07 53 KEYWAY 13 GND 34 +3.
Table A.3 PCI Connector J1 (Back) Signal Name Signal Name Pin Signal Name Pin TRST/ 1 AD28 22 GND 42 +12 V 2 AD26 23 PAR 43 TMS 3 GND 24 AD15 44 TDI 4 AD24 25 +3.3 V 45 +5 V 5 IDSEL 26 AD13 46 INTA/ 6 +3.3 V 27 AD11 47 INTC/ 7 AD22 28 GND 48 +5 V 8 AD20 29 AD09 49 RESERVED 9 GND 30 KEYWAY 50 +5 V 10 AD18 31 KEYWAY 51 RESERVED 11 AD16 32 C_BE0/ 52 KEYWAY 12 +3.3 V 33 +3.
A.2.2 The SCSI Interface The SCSI interface conforms to ANSI X 3T10.11/1142. The SCSI interface operates as 16-bit, synchronous or asynchronous, SE or LVD, and supports SCSI-3 protocols and 8-bit and16-bit arbitration. The interface is made through connectors J2 and J3. Active SE or LVD SCSI termination is provided automatically. SCSI TERMPWR is supplied by the board. Connector J2 is a 68-pin HD right angle header used for internal connections.
Table A.
Table A.5 External SCSI Connector J3 Signal Name Pin SD12+ 1 SD13+ 2 SD14+ 3 SD15+ 4 SDP1+ 5 SD00+ 6 SD01+ 7 SD02+ 8 SD03+ 9 SD04+ 10 SD05+ 11 SD06+ 12 SD07+ 13 SDP0+ 14 GND 15 DIFFSENS 16 TERMPWR 17 TERMPWR 18 N/C 19 GND 20 SATN+ 21 GND 22 SBSY+ 23 SACK+ 24 SRST+ 25 TERMPWR 51 TERMPWR 52 N/C 53 GND 54 SATN− 55 GND 56 SBSY− 57 SACK− 58 SRST− 59 Note: When operated in the SE are clamped to ground.
A.2.3 On-Board LED On-board LEDs are used to indicate the status of the SCSI bus. The SCSI Activity LED lights when the SCSI bus is transferring information. A.2.4 The SCSI Busy LED The SCSI Activity LED interface on the LSIU80ALVD is a four-wire arrangement that allows the user to connect an LED harness to the board. The buffered GPIO0_FETCH line (maximum output low voltage 0.4 V and minimum output low current 16 mA) is pulled low to complete the circuit when a harness with an LED is attached.
Appendix B Glossary of Terms and Abbreviations Active Termination The electrical connection required at each end of the SCSI bus, composed of active voltage regulation and a set of termination resistors. Ultra and Ultra2 SCSI require active termination. Address A specific location in memory, designated either numerically or by a symbolic name. Asynchronous Data Transfer One of the ways data is transferred over the SCSI bus. It is slower than synchronous data transfer. BIOS Basic Input/Output System.
make up a computer system; or the software settings that allow the hardware components to communicate with each other. CPU Central Processing Unit. The “brain” of the computer that performs the actual computations. The term Microprocessor Unit (MPU) is also used. DMA Direct Memory Access. DMA Bus Master A feature that allows a peripheral to control the flow of data to and from system memory by blocks, as opposed to PIO (Programmed I/O) where the processor is in control and the flow is by byte.
File A named collection of information stored on a disk. Firmware Software that is permanently stored in ROM. Therefore, it can be accessed during boot time. Hard Disk A disk made of metal and permanently sealed into a drive cartridge. A hard disk can store very large amounts of information. Host The computer system in which a SCSI host adapter is installed. It uses the SCSI host adapter to transfer information to and from devices attached to the SCSI bus.
Main Memory The part of a computer’s memory which is directly accessible by the CPU (usually synonymous with RAM). Mbyte Megabyte. A measure of computer storage equal to 1024 kilobytes. Motherboard See Mainboard. In some countries, the term Motherboard is not appropriate. Multitasking The executing of more than one command at the same time. This allows programs to operate in parallel. Multithreading The simultaneous accessing of data by more than one SCSI device. This increases the data throughput.
PIO Programmed Input/Output. A way the CPU can transfer data to and from memory using the computer’s I/O ports. PIO is usually faster than DMA, but requires CPU time. Port Address Also Port Number. The address through which commands are sent to a host adapter board. This address is assigned by the PCI bus. Port Number See Port Address. Queue Tags A way to keep track of multiple commands that allow for increased throughput on the SCSI bus. RAM Random Access Memory.
SCSI Bus A host adapter and one or more SCSI peripherals connected by cables in a linear chain configuration. The host adapter may exist anywhere on the chain, allowing connection of both internal and external SCSI devices. A system may have more than one SCSI bus by using multiple host adapters. SCSI Device Any device that conforms to the SCSI standard and is attached to the SCSI bus by a SCSI cable. This includes SCSI host adapters and SCSI peripherals.
Ultra SCSI A standard for SCSI data transfers. It allows a transfer rate of up to 20 Mbytes/s over an 8-bit SCSI bus and up to 40 Mbytes/s over a 16-bit SCSI bus. STA (SCSI Trade Association) supports using the term “Ultra SCSI” over the older term “Fast-20”. Ultra2 SCSI A standard for SCSI data transfers. It allows a transfer rate of up to 40 Mbytes/s over an 8-bit SCSI bus, and up to 80 Mbytes/s over a 16-bit SCSI bus.
B-8 Glossary of Terms and Abbreviations
Index A E adapter boot order menu 3-5 adapter setup menu CHS mapping 3-10 host SCSI ID 3-9 parity 3-8 removable media support 3-9 SCAM support 3-8 scan order 3-9 additional adapter configuration menu 3-6 alternate CHS mapping 3-10 edge connector 2-5 electrical characteristics A-2 electromagnetic compliance A-3 erroneous termination 2-18 esc key option 3-7 exit this menu 3-14 exiting the configuration utility quit option 3-14 external SCSI bus connections 2-15 connector J3 A-9 device 2-16 device terminat
logical units (LUNs) 3-13 LVDlink technology 1-5 setting SCSI IDs 2-22 spinup delay (seconds) 3-10 starting the SCSI BIOS configuration utility 3-2 storage device management system (SDMS) 1-1 sync rate option 3-12 M main menu display 3-3 main menu options display mode 3-6 esc key 3-7 help 3-7 language 3-6 mono/color 3-6 quit 3-7 multiple internal SCSI devices 2-13 termination 2-18 (erroneous) 2-18 thermal, atmospheric characteristics A-3 U Ultra SCSI 2-7 Ultra2 SCSI 1-5 utilities menu adapter setup 3-7
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