ASUS LSI896 User Manual
LSI Integrated SCSI
LSI 896 32-bit 2Ch. Ultra2 SCSI
LSI 1010-33 32-bit 2Ch. Ultra160 SCSI
LSI 1010-66 64-bit 2Ch. Ultra160 SCSI
Contents
General Description ..................................................................... 3
SCSI Interface......................................................................... 3
The SCSI Interface ................................................................. 4
Wide Ultra2 SCSI.................................................................... 4
Connecting Your SCSI Peripherals ......................................... 5
SCSI Bus Termination .................................................................. 5
Internal SCSI Connections...................................................... 5
External SCSI Connections .................................................... 6
Internal and External SCSI Connections ................................ 6
Setting SCSI IDs ..................................................................... 6
Setting Interrupts.......................................................................... 7
Configuring the LSI Integrated SCSI............................................ 7
The SCSI BIOS Utility .................................................................. 8
Exiting the SCSI BIOS Utility...................................................... 14
Glossary of Terms and Abbreviations......................................... 15
2 ASUS LSI SC896
1. Introduction
General Description
The onboard LSI integrated Dual Channel Ultra2 SCSI provides two SCSI-3,
Ultra2 SCSI interfaces that require BIOS support. The dual channel LSI integrated SCSI provides 16-bit Low Voltage Dif ferential (L VD) and Single-Ended
(SE) SCSI solutions for your computer. This supports legacy Fast SCSI devices, Ultra SCSI devices, Ultra2 SCSI devices, and the newest Ultra160 SCSI
devices. PCI SCSI Device Management System (SDMS™) software operates
the chipset, but the design of the chipset does not prevent other software to be
used with it. BIOS support for this chipset is incorporated in the ASUS motherboard BIOS.
SCSI Interface
• Two separate SCSI channels
• 16-bit SE/LVD
1. Introduction
• Automatically enabled termination
• One 68-pin high-density for channel A
• One 68-pin high-density for channel B
• Fast, Ultra, and Ultra2 data transfer capability
• SCSI TERMPWR source with autoresetting circuit breaker and
TERMPWR shorted LED for each channel
• SCSI Plug and Play
• SCAM (SCSI Configured AutoMatically).
• Flash EEPROM for BIOS storage
• Serial NVRAM (Non Volatile Random Access Memory) on each channel for user configuration utility and SCAM information storage
ASUS LSI SCSI User’s Manual 3
1. Introduction
1. Introduction
The SCSI Interface
The SCSI functionality for the LSI integrated SCSI is contained within the LSI
integrated PCI-SCSI I/O Processor chip. The LSI integrated SCSI connects
directly to the two SCSI buses for SE or L VD SCSI applications and generates
timing and protocol in compliance with the SCSI standard. Each SCSI interface operates at a burst transfer rate of up to 40 Mbyte per second for wide
single-ended transfers, and up to 80 Mbyte per second for wide LVD SCSI
transfers.
The SCSI interfaces on the LSI integrated SCSI operates as two 16-bit, synchronous or asynchronous, single-ended or LVD, and supports Ultra2 SCSI
protocols and 16-bit arbitration. The LSI integrated SCSI provides autosensing,
dual mode SE/L VD SCSI termination. T ermination is normally enabled. When
a SCSI device is sensed to be connected to both connectors, LSI integrated
SCSI termination is automatically disabled. The LSI integrated SCSI supplies
SCSI bus TERMPWR (termination power) through a blocking diode and selfresetting 1.5 A short circuit protection device. A 40 MHz oscillator is installed
with the LSI integrated SCSI to provide the clock frequency to the LSI integrated SCSI that is necessary to support W ide Ultra2 SCSI transfers of up to 80
Mbytes/s.
Wide Ultra2 SCSI
The LSI integrated SCSI has full support for W ide Ultra2 SCSI. This interface is
an extension of the SCSI-3 family of standards that expands the bandwidth of the
SCSI bus to allow faster synchronous data transfers, up to 80 Mbytes/s. Wide
Ultra2 SCSI provides a doubling of the data rate over the Ultra2 SCSI interface,
while it increases cable lengths and allows a larger number of devices on the
cable than Ultra2 SCSI interfaces. Special SCSI cables are specified for operation with Wide Ultra and Ultra2 SCSI devices, and you must consider the total
number of devices and the length of your SCSI bus when setting up your system.
The cable provided is matched for a Fast/Ultra/Ultra2 SE or LVD operation.
This cable also has built-in L VD termination since most Ultra2 hard disk drives
are not made with onboard LVD termination.
4 ASUS LSI SCSI User’s Manual
1. Introduction
Connecting Your SCSI Peripherals
All internal SCSI bus connections to the LSI integrated SCSI integrated SCSI
are made with an unshielded, 68-conductor ribbon cable. One side of this cable
is marked with a color to indicate the pin-1 side. The connectors on this cable
are keyed to ensure proper pin-1 connection. Use Ultra/Ultra2 rated cables for
these bus speeds.
All external SCSI bus connections to the LSI integrated SCSI integrated SCSI
are made with shielded, 68-conductor cables. The connectors on this cable are
always keyed to ensure proper pin-1 connection. Some internal cables come
with a SE/LVD on one end. This end should be furthest from the integrated
SCSI.
SCSI Bus Termination
1. Introduction
The devices that make 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 a set of resistors called terminators. All other SCSI
devices on the bus must have their terminators removed or disabled.
REMEMBER: The LSI integrated SCSI integrated SCSI is also on the
SCSI bus, and its termination is automatically enabled when it is connected to the end of the bus.
Low-voltage differential peripheral devices are normally terminated with external terminators, but are sometimes set with jumpers or with a switch on the
peripheral. Refer to the peripheral manufacturer’s instructions and to the user’s
manual for your computer for information on how to identify the terminator
setting of each device and how to change it.
When connecting another integrated SCSI to a connector, termination must be
disabled on the board that is not at the end of the bus through software control.
Internal SCSI Connections
If only internal SCSI device connections on your integrated SCSI have been
made, then terminate the last internal device on the SCSI bus. You must disable
the termination on all other devices. Termination on the LSI integrated SCSI
integrated SCSI is automatically enabled in this case.
ASUS LSI SCSI User’s Manual 5
2. Starting
External SCSI Connections
If only external SCSI device connections have been made, then terminate the
last external device on the SCSI bus. You must disable the termination on all
other devices. Termination on your integrated SCSI is automatically enabled
in this case.
2. Starting
Internal and External SCSI Connections
If internal and external SCSI devices are connected, then terminate the last
internal and external devices on the SCSI bus. You must disable the termination on all other devices. T ermination on your integrated SCSI is automatically
disabled in this case.
NOTE: If an internal connection to another LSI integrated SCSI has been
made, or any connection to a device that uses the same sensing method
for automatic termination as your LSI integrated SCSI, you must override the termination for that channel through software control.
Setting SCSI IDs
Y ou must set each SCSI device and the integrated SCSI to a separate SCSI ID, 0
through 15 for a 16-bit SCSI. SCSI ID 7 is the preset integrated SCSI setting,
giving it the highest priority on the SCSI bus. If you plan to boot your computer
from a hard disk drive on the SCSI bus, that drive should have SCSI ID 0, or the
lowest SCSI ID on the bus. The peripheral device SCSI IDs are usually set with
jumpers or with a switch on the peripheral. Refer to the peripheral manufacturer’s
instructions and to the user’s manual for your computer to determine the ID of
each device and how to change it. You must have no duplication of SCSI IDs on
a SCSI bus.
NOTE: As SCAM support is OFF by default for the LSI integrated SCSI,
you may choose to turn this ON to assist in assigning SCSI IDs.
Determine the SCSI ID of each device on the SCSI bus. Note any duplications.
Make any necessary changes to the SCSI IDs and record the IDs for future
reference.
6 ASUS LSI SCSI User’s Manual
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