LSI SYM8953U User Manual
®
Symbios
SYM8953U
PCI to Ultra2 SCSI
Host Adapter
User’s Guide
December 1999
Version 1.0
Order Number S14036
®
Electromagnetic Compatibility Notices
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. 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. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful int e rference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or t elevision reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and t he receiver.
• Connect the equipment into an outlet on a circuit different from that to which t he receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Shielded cables for SCSI connection external to the cabinet are used in the compliance testing of this Product. LSI
Logic is not responsiblefor any radio or television interference caused byunauthor ized modification of this equipment
or the substitution or attachment of c onnecting cables and equipment other than those specified by LSI Logic. The
correction of interferences caused by such unauthorized modification, substitution, or attachment will be the
responsibility of the user.
The LSI Logic Symbios
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du
Canada.
®
SYM8953U is tes ted to comply with FCC standards for home or office use.
This is a Class B product based on the standard of the Voluntary Control Council for Interference from Information
Technology Equipment (VCCI). If this is used near a radio or television receiver in a domestic environment, it may
cause radio interference. Install and use the equipment according to the instruction manual.
LSI Logic Corporation
North American Headquarters
Milpitas, CA
408.433.8000
ii
This document c ontains proprietar y 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.
Document DB15-000133-00, First Edition (December 1999). This document
describes Version 1.0 of the LSI Logic Corporation SYM8953U PCI to Ultra2
SCSI Host Adapter and will remain the official reference source for all
revisions/releases of this product until rescinded by an update.
To receive product literature, visit us at http://www.lsilogic.com.
LSI Logic Corporation reserves the right to make changes to any products herein
at any time without notice. LSI Logic does not assume any responsibility or
liability arising out of the application or use of any product described herein,
except as expressly agreed to in writing by LSI Logic; nor does the purchase or
use of a product from LSI Logic convey a license under any patent rights,
copyrights, trademark rights, or any other of the intellectual property rights of LSI
Logic or third parties.
Copyright © 1999 by LSI Logic Corporation. All rights reserved.
TRADEMARK ACKNOWLEDGMENT
The LSI Logic logo design and Symbios are registered trademarks and SDMS,
SCRIPTS, and LVD Link are trademarks of LSI Logic Corporation. All other brand
and product names may be trademarks of their respective companies.
HH
iii
iv
Contents
Chapter 1 Using the SYM8953U Host Adapter
1.1 General Description 1-1
1.2 Features 1-2
1.2.1 PCI Interface 1-2
1.2.2 SCSI Interface 1-2
1.2.3 Board Characteristics 1-3
1.3 Interface Descriptions 1-3
1.3.1 The PCI Interface 1-4
1.3.2 The SCSI Interface 1-4
1.3.3 Ultra2 SCSI Technology 1-5
1.3.4 LVD Link Technology 1-5
1.3.5 On-Board LED 1-6
Chapter 2 Installing the SYM8953U Host Adapter
2.1 Quick Installation Procedure 2-1
2.2 Detailed Installation Procedure 2-3
2.2.1 Before You Start 2-3
2.2.2 Inserting the Host Adapter 2-4
2.2.3 Connecting the SCSI Peripherals 2-7
2.2.4 Making Internal SCSI Bus Connections 2-10
2.2.5 Making External SCSI Bus Connections 2-15
2.2.6 SCSI Bus Termination 2-18
2.2.7 Setting SCSI IDs 2-22
2.3 Completing the Installation 2-24
Chapter 3 Configuring the SYM8953U Host Adapter
3.1 Overview of the SCSI BIOS Configuration Utility 3-1
3.1.1 Starting the Configuration Utility 3-2
3.1.2 Exiting the SCSI BIOS Configuration Utility 3-3
Contents v
3.2 The Symbios SCSI BIOS Configuration Utility Menus 3-3
3.2.1 Using the Menus 3-3
3.2.2 Main Menu 3-4
3.2.3 Adapter Properties Menu 3-6
3.2.4 Device Properties Menu 3-10
3.2.5 Boot Adapter List Menu 3-15
3.2.6 Global Properties Menu 3-18
3.2.7 Exit Menu 3-20
Appendix A Technical Specifications
A.1 Physical Environment A-1
A.1.1 Physical Characteristics A-1
A.1.2 Electrical Characteristics A-2
A.1.3 Thermal, Atmospheric Characteristics A-3
A.1.4 Electromagnetic Compliance A-3
A.1.5 Safety Characteristics A-3
A.2 Operational Environment A-3
A.2.1 The PCI Interface A-4
A.2.2 The SCSI Interface A-7
A.2.3 On-Board LED A-10
A.2.4 The SCSI Busy LED A-10
Appendix B Glossary of Terms and Abbreviations
Index
Customer Feedback
Figures
2.1 Hardware Connections for the SYM8953U Host Adapter 2-5
2.2 Inserting the Host Adapter 2-6
2.3 SCSI Cables 2-9
2.4 Internal SCSI Ribbon Cable to Host Adapter Connection 2-10
2.5 Internal SCSI Ribbon Cable to Internal SCSI Device
Connection 2-11
2.6 Connecting Additional Internal SCSI Devices 2-12
vi Contents
Tables
2.7 Multiple Internal SCSI Devices Chained Together 2-13
2.8 SCSI LED Connector 2-14
2.9 External Cable to Host Adapter 2-15
2.10 External SCSI Device Cable 2-16
2.11 Multiple External SCSI Devices Chained Together 2-17
2.12 Internal SCSI Device Termination 2-19
2.13 External SCSI Device Termination 2-20
2.14 Internal and External SCSI Device Termination 2-21
3.1 Main Menu 3-5
3.2 Adapter Properties Menu 3-7
3.3 Device Properties Menu (Left Half) 3-11
3.4 Device Properties Menu (Right Half) 3-12
3.5 Boot Adapter List Menu 3-16
3.6 Global Properties Menu 3-18
3.7 Exit Menu 3-20
A.1 SYM8953U Mechanical Drawing A-2
2.1 SCSI Bus Widths and Speeds 2-7
2.2 SCSI Bus Lengths 2-8
2.3 SCSI ID Record 2-23
3.1 Configuration Commands 3-4
3.2 Main Menu Fields and Descriptions 3-5
3.3 Adapter Properties Fields and Descriptions 3-8
3.4 Device Properties Fields and Descriptions 3-13
3.5 Boot Adapter List Fields and Descriptions 3-17
3.6 Global Properties Fields and Descriptions 3-19
A.1 Maximum Power Requirements A-2
A.2 PCI Connector J1 (Front) A-5
A.3 PCI Connector J1 (Back) A-6
A.4 Internal SCSI Connector J2 A-8
A.5 External SCSI Connector J3 A-9
A.6 LED Connector J4 A-10
Contents vii
viii Contents
Preface
Audience
Organization
This book is the primary reference and user’s guide for the LSI Logic
Symbios
complete functional description for the SYM8953U as well as complete
physical and electrical specifications.
This document assumes that you have some familiarity with SCSI
protocol and related support devices and will benefit persons installing
and using the SYM8953U Host Adapter Board.
®
SYM8953U PCI to Ultra2 SCSI Host Adapter. It contains a
• Chapter 1, Using the SYM8953U Host Adapter, defines the
interfaces and characteristics of the SYM8953U PCI to Ultra2 SCSI
Host Adapter Board.
• Chapter 2, Installing the SYM8953U Host Adapter, provides both
quick and detailed installation instructions.
• Chapter 3, Configuring the SYM8953U Host Adapter, describes
the SCSI BIOS Configuration Utility to configure adapter and device
settings.
• Appendix A, Technical Specifications, describes the physical and
operational environments of the SYM8953U Host Adapter Board.
• Appendix B, Glossary of Terms and Abbreviations,provides
definitions of various terminology that is referenced throughout this
user’s guide.
Preface ix
Related Publications
Symbios
Guide, LSI Logic Corporation, Order Number S14007
®
PCI SCSI Device Management System SDMS™ 4.0 User’s
Symbios
®
SYM53C895A PCI to Ultra2 SCSI Controller Technical
Manual, LSI Logic Corporation, Order Number S14028
xPreface
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Chapter 1
Using the SYM8953U
Host Adapter
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This chapter describes the SYM8953U Host Adapter interface to PCI
computer systems and includes these topics:
• Section 1.1, “General Description,” page 1-1
• Section 1.2, “Features,” page 1-2
• Section 1.3, “Interface Descriptions,” page 1-3
1.1 General Description
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The LSI Logic Corporation Symbios®SYM8953U PCI to Ultra2 SCSI
Host Adapter board provides an Ultra2 SCSI interface to PCI computer
systems. It is referred to as the SYM8953U throughout this guide.
Installing this adapter in your PCI system allows connection of up to 15
SCSI devices.
The SYM8953U board is a 16-bit, Low Voltage Differential (LVD)/SingleEnded (SE) SCSI solution for your computer. This board also supports
legacy Fast SCSI and Ultra SCSI devices, and the newest LVD Ultra2
SCSI devices. It is also backwards compatible with existing wide SCSI
applications for the SYM8251S and SYM8751SP/E host adapters.
Symbios SCSI Device Management System (SDMS™) software
operates the board. SCSI software provided by other vendors that works
with the SYM53C895A chip can also be used. BIOS support for this
adapter is incorporated on the board in a Flash memory device. The
SYM8953U host adapter has a serial EEPROM device for storing the
user’s SCSI bus configuration.
The SYM53C895A chip also contains a SCSI SCRIPTS™ processor that
permits both DMA and SCSI commands to be fetched from host memory
or internal SCRIPTS RAM. Algorithms written in SCSI SCRIPTS control
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Symbios SYM8953U PCI to Ultra2 SCSI Host Adapter 1-1
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the actions of the SCSI and DMA cores. The SCRIPTS processor
executes complex SCSI bus sequences independently of the host CPU.
For more information on the SCSI SCRIPTS Instruction Set used to write
these algorithms, refer to the Symbios SYM53C895A PCI to Ultra2 SCSI
Controller Technical Manual.
This user’s guide, along with the Symbios PCI SCSI Device Management
System SDMS 4.0 User’s Guide, contains a complete library of product
information and installation instructions. With this information, the full
benefits of your SYM8953U PCI to Ultra2 SCSI Host Adapter are
available to you.
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1.2 Features
This section provides a high-level overview of the PCI Interface,theSCSI
Interface, and Board Characteristics for the SYM8953U Host Adapter
board.
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1.2.1 PCI Interface
• Supports 32-bit DMA bus master with 64-bit addressing
• Burstsupto133Mbytes/s(@33MHz)withzerowait-statebus
master data
• Supports universal 3.3 V and 5 V PCI bus voltage
• Supports 32-bit 33 MHz data bursts with variable burst lengths
• Bursts 2 to 128 dwords across the PCI bus
• Prefetches up to 8 dwords of SCRIPTS instructions
• Supports PCI Write and Invalidate, Read Line, and Read Multiple
commands
1.2.2 SCSI Interface
• Supports 16-bit LVD and SE signaling
• Supports SCRIPTS
– Includes 8 Kbytes RAM for SCRIPTS instruction storage
• Automatically enables LVD or SE termination
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1-2 Using the SYM8953U Host Adapter
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• Contains external 68-pin High Density (HD) and internal 68-pin HD
latching connectors
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• Perf orms wide Ultra2 SCSI LVD synchronous transfers up to
80 Mbytes/s
• Supports SCSI synchronous offset up to 31
• Provides SCSI termination power (TERMPWR) source with
autoresetting circuit protection device
• Supports SCSI Configured AutoMatically (SCAM) Level 1 Capability
(Set “OFF” by default)
• Utilizes flash ROM for BIOS storage for up to 256 Kbytes
• Supports variable block size and scatter/gather data transfers
• Performs complex SCSI bus sequences without interrupts, including
restore data pointers
• Has serial EEPROM for user configuration utility
• Has SCSI bus activity LED connector and on-board LED
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1.2.3 Board Characteristics
• PCI board dimensions,
152.4 x 88.90 mm (6.00 x 3.5 inches)
• PCI Universal 32-bit card edge connector
• HD 68-pin external connector
• HD 68-pin internal connector
A mechanical drawing showing board dimensions and component layout
is located in Appendix A, “Technical Specifications”.
1.3 Interface Descriptions
This section provides a more detailed explanation about the PCI
Interface, the SCSI Interface, Ultra2 SCSI Technology, and LVD Link™
Technology.
=
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Interface Descriptions 1-3
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1.3.1 The PCI Interface
PCI, a high-speed standard local bus, interfaces I/O components to the
processor and memory subsystems in equipment ranging from PCs to
servers. The PCI functionality for the SYM8953U is contained within the
Symbios SYM53C895A PCI to Ultra2 Controller with LVD Link Universal
Transceivers. The SYM53C895A connects directly to the PCI bus and
generates signal timing and bus protocol in compliance with the PCI
Specification Revision 2.2.
The PCI interface operates as a 32-bit DMA bus master capable of
64-bit addressing. The connection is made through edge connector J1,
shown in Figure 2.1. The signal definitions and pin numbers conform to
the PCI Local Bus Specification Revision 2.2 standard. The SYM8953U
host adapter conforms to the PCI universal signaling environment for a
5 V or 3.3 V PCI bus.
1.3.2 The SCSI Interface
The SCSI functionality for the SYM8953U is contained within the
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SYM53C895A. This chip is a PCI to Ultra2 SCSI Controller with LVD Link
Universal Transceivers. It connects directly to the SCSI bus and
generates signal timing and bus protocol in compliance with SCSI
standards.
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The SCSI interface on the SYM8953U 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. The
interface is made through connectors J2 and J3 (see Figure 2.1). Internal
connector J2 is a 68-pin HD right angle latching connector . External
connector J3 is a shielded 68-pin HD right angle connector exposed in
the back panel bracket. An on-board LED (labeled Activity) indicates
SCSI bus activity. LVD/SE dual mode, active termination is provided on
the SYM8953U board. Termination is automatically disabled when both
SCSI connectors are used. The SYM8953U supplies SCSI bus
TERMPWR through a blocking diode and a self-resetting 1.5 A short
circuit protection device. A 40 MHz oscillator is installed on the
SYM8953U to provide the clock frequency to the SYM53C895A that is
necessary to support Ultra2 SCSI transfers of up to 80 Mbytes/s.
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1.3.3 Ultra2 SCSI Technology
The SYM8953U 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. SCSI2 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. Make sure that your SCSI cables are
rated for standard SCSI (Fast, Ultra, and Ultra2) environments.
Chapter 2, “Installing the SYM8953U Host Adapter” has a detailed
explanation of SCSI bus connections.
1.3.4 LVD Link Technology
To support greater device connectivity and a longer SCSI cable, the
SYM8953U features LVD Link technology, the LSI Logic implementation
of Universal LVD SCSI. LVD Link transceivers provide the inherent
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reliability of differential SCSI, and a long-term migration path to faster
SCSI transfer rates.
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The LVD Link transceivers reduce the power needed to drive the SCSI
bus, so that the I/O drivers can be integrated directly into the chip. LVD
Link technology lowers the amplitude of noise reflections and allows
higher transmission frequencies.
The LVD Link transceivers operate in LVD and SE modes. They also
allow the chip to detect a High Voltage Differential (HVD) signal when the
chip is mistakenly connected to external HVD transceivers. When
connected, the SYM53C895A chip automatically detects signal type,
based on the voltage detected. It automatically switches to the SE or LVD
mode, as appropriate. All bus devices must be LVD or SE. If a HVD
device is detected, the board puts the SCSI bus in the high impedance
state and shuts down.
1.3.4.1 Benefits of LVD Link
LVD Link, supported by the SYM53C895A, is a signaling technology that
increases the reliability of SCSI data transfers over longer distances than
supported by SE SCSI. The low current requirements of LVD allow direct
Interface Descriptions 1-5
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integration of I/O transceivers into the chip. LVD provides the reliability of
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HVD SCSI without the added cost of external differential transceivers.
Ultra2 SCSI with LVD allows a longer SCSI cable and more devices on
the bus, using the same cables defined in the SCSI-3 parallel Interface
(SPI-2) standard for Ultra SCSI.
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Important:
1.3.5 On-Board LED
An on-board LED (CR1) indicates the status of the SCSI bus. This SCSI
Activity LED lights when the SCSI bus is transferring information. It is
located near J4 (see Figure A.1).
To utilize Ultra2 SCSI performance, you must only have
LVD devices on the bus. Do not mix any SE devices with
LVD devices or the entire bus will drop to SE, limiting bus
performance to Ultra SCSI levels.
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Chapter 2
Installing the SYM8953U
Host Adapter
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This chapter provides instructions on how to install the SYM8953U Host
Adapter and includes these topics:
• 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
2.1 Quick Installation Procedure
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This section provides an overview of the installation procedure. If you are
an experienced computer user with prior host adapter installation and
SCSI bus setup experience, this section may sufficiently describe the
procedure for you. If you prefer a more detailed guidance for installing
the SYM8953U host adapter, proceed to Section 2.2, “Detailed
Installation Procedure.”
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.
Step 2. Remove the SYM8953U PCI to Ultra2 SCSI Host Adapter
board from the packing and check that it is not damaged.
An example of this host adapter board is shown in Figure 2.1.
A more detailed drawing is located in Figure A.1.
Step 3. Switch off and unplug the system.
Step 4. Remove the cabinet cover on your computer to access the PCI
slots.
Caution:
Ground yourself by touching a metal surface before
handling boards. Static charges on your body can damage
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Symbios SYM8953U PCI to Ultra2 SCSI Host Adapter 2-1
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electronic components. Handle plug-in boards by the edge;
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do not touch board components or gold connector contacts.
The use of a static ground strap is recommended.
Step 5. Locate the slots for installing a PCI plug-in board.
The SYM8953U requires a PCI slot that allows bus master
operation. See Figure 2.2.
Step 6. Remove the blank bracket panel on the back of the computer
aligned with the PCI slot you intend to use.
Save the bracket screw for securing the installed board.
Step 7. 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.
The bracket around connector J3 (see Figure 2.1) should fit
where the blank bracket panel was removed.
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Note:
You may notice that the components on a PCI host adapter
face the opposite way from non-PCI adapter boards you
have in your system. This orientation is correct. The board
is keyed and will only go in one way.
Step 8. Secure the bracket with the bracket screw before making the
internal and external SCSI bus connections.
Step 9. If you are connecting any internal SCSI devices, plug a 68-pin
connector on the end
of the internal SCSI ribbon cable into
connector J2 (see Figure 2.1).
Be sure you match pin 1 on both connectors.
Step 10. Connect the LED cable to J4 if desired.
This is designed to drive an off-board system LED and
indicates activity on the SCSI bus. The off-board LED will
operate at the same time as the on-board SCSI Activity LED.
Step 11. Replace the cabinet cover as described in the user’s manual for
your computer.
Step 12. Make all external SCSI bus connections.
Step 13. Refer to the Symbios PCI SCSI Device Management System
SDMS 4.0 User’s Guide (or the guide for the software you will
use) to load the driver software for your particular operating
system.
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2-2 Installing the SYM8953U Host Adapter
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Remember: The SCSI bus requires proper termination, and no duplicate
SCSI IDs.
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2.2 Detailed Installation Procedure
This section provides step-by-step instructions for installing the
SYM8953U host adapter board, and connecting it to your SCSI
peripherals. If you are experienced in these tasks, you may prefer to use
Section 2.1, “Quick Installation Procedure.”
2.2.1 Before You Start
Before starting, look through the following task list to get an overall idea
of the steps you will be performing. If you are not confident you can
perform the tasks as described here, LSI Logic suggests getting
assistance.
• Open your PC cabinet and select an appropriate open PCI slot
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• Insert the host adapter board
• Connect the internal and external SCSI peripherals
• Terminate the SCSI bus
• Set the peripheral SCSI IDs
• Make any configuration changes
• Close your PC cabinet
• Install the software
The SCSI host adapter acts on your computer’s behalf as the host to
your suite of SCSI peripherals. Each chain of SCSI peripheral devices
and their host adapter work together, and are referred to as a SCSI bus.
Each SCSI host adapter that you install can act as host for up to 15
peripheral devices, not including the adapter itself.
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Detailed Installation Procedure 2-3
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2.2.2 Inserting the Host Adapter
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For safe and proper installation, you will need the user’s manual supplied
with your computer for reference. Perform the steps listed below to install
the SYM8953U.
Step 1. Ground yourself before removing this host adapter board.
Step 2. Remove the SYM8953U PCI to Ultra2 SCSI Host Adapter
board from the packing and check that it is not damaged.
An example of this host adapter board is shown in Figure 2.1.
A more detailed drawing is located in Figure A.1.
Step 3. Switch off the computer and unplug power cords for all
components in your system.
Step 4. Remove the cover from your computer per the instructions in
the user’s manual for your system to access the PCI slots.
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Caution:
Ground yourself by touching a metal surface before
removing the cabinet top. Static charges on your body can
damage electronic components. Handle plug-in boards by
the edge; do not touch board components or gold
connector contacts. The use of a static ground strap is
recommended.
Step 5. Locate the slots for PCI plug-in board installation.
Refer to the user’s manual for your computer to confirm the
location of the PCI slots.
Important
: The SYM8953U board requires a PCI slot that allows bus
master operation.
Step 6. Remove the blank bracket panel on the back of the computer
aligned with the PCI slot you intend to use.
Save the bracket screw.
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Figure 2.1 Hardware Connections for the SYM8953U Host Adapter
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External
SCSI
Interface
J3
Internal
SCSI
Interface
J2
LED
Connector
J4
SYM8953U
J1 to PCI Mainboard
Step 7. 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.The
bracket around connector J3 should fit where you removed the
blank panel.
Note:
You may notice that the components on a PCI host adapter
face the opposite way from non-PCI adapter boards you
have in your system. This orientation is correct. The board
is keyed and will only go in one way.
Detailed Installation Procedure 2-5
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Figure 2.2 Inserting the Host Adapter
Bracket Screw
Bracket Surround
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Step 8. Secure the board with the bracket screw (see Figure 2.2)before
making the internal and external SCSI bus connections.
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2-6 Installing the SYM8953U Host Adapter
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2.2.3 Connecting the SCSI Peripherals
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SCSI bus connections to the SYM8953U host adapter inside your
computercanbemadewithanunshielded68conductorUltraSCSIPVC
ribbon cable (see Figure 2.3).Theleadconnectedtopin1onthecable
is marked with a colored stripe. The connectors on this cable may also
be keyed to ensure proper pin-1 connection.
All external SCSI bus connections to the SYM8953U host adapter are
made with high quality shielded 68 conductor cables (see Figure 2.3).
The connectors on this cable are always keyed to ensure proper pin-1
connection.
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Note:
All the cables shown in Figure 2.3 are included in the
Symbios Adapter Board Kit for the SYM8953U host
adapter.
Table 2.1 SCSI Bus Widths and Speeds
STA Terms
SCSI-1 8 5
Fast SCSI 8 10
Fast Wide SCSI 16 20
Ultra SCSI 8 20
Wide Ultra SCSI 16 40
Ultra2 SCSI 8 40
Wide Ultra2 SCSI 16 80
Note: Absence of the word “Wide” means an 8-bit bus width. It is
acceptable to use the word “Narrow” to avoid ambiguity.
SCSI Bus
Width, Bits
SCSI Bus Speed
Maximum Data Rate,
Mbytes/s
You can connect up to eight SCSI, Fast SCSI, and Ultra SCSI devices
on a SE Ultra SCSI bus only if they are evenly spaced on a 1.5-meter
Ultra SCSI cable (0.19 m between devices).
Detailed Installation Procedure 2-7
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You can connect up to four devices if they are evenly spaced on a
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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 L VD 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 2.2 SCSI Bus Lengths
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Maximum Bus Length, Meters
1
Maximum #
SE Differential LVD
of Devices
SCSI-1 6 25 12 8
Fast SCSI 3 25 12 8
Fast Wide SCSI 3 25 12 16
Ultra SCSI 1.5
Ultra SCSI 3
2
2
25 12 8
––4
Wide Ultra SCSI – 25 12 16
Wide Ultra SCSI 1.5 – – 8
Wide Ultra SCSI 3 – – 4
Ultra2 SCSI Note
Wide Ultra2 SCSI Note
3
3
Note
Note
3
3
12 8
12 16
1. This parameter may be exceeded in point-to-point and engineered
applications.
2. Additional spacing rules apply.
3. SE and high power differential are not defined at Ultra2 speeds.
2-8 Installing the SYM8953U Host Adapter
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Figure 2.3 SCSI Cables
Terminated SCSI Cable for Internal Connections
(for use with nonterminated internal devices)
68-pin HD
Terminated End
SCSI Cable for Internal Connections
68-pin HD
SCSI Cable for External Connections
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68-pin HD
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Detailed Installation Procedure 2-9
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2.2.4 Making Internal SCSI Bus Connections
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This section provides step-by-step instructions about making internal
SCSI bus connections.
Step 1. Plug one end of the 68-pin internal SCSI ribbon cable into
connector J2 (see Figure 2.4).
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Important
: You must match pin 1 on this and all subsequent
connections.
Figure 2.4 Internal SCSI Ribbon Cable to Host Adapter
Connection
Internal
SCSI Interface
J2
2-10 Installing the SYM8953U Host Adapter
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Step 2. If you have only two internal devices to connect, plug the other
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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.
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Note:
For nonterminated internal SCSI devices, a terminated
cable will be required. This connector must be on the end
of the SCSI cable.
Figure 2.5 Internal SCSI Ribbon Cable to Internal SCSI Device Connection
Detailed Installation Procedure 2-11
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