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CHAPTER 2: Introduction
2. Introduction
The Ultra2 LVD SCSI Host Adapter (our product code IC515C) is a high-
performance Ultra2 SCSI (Low Voltage Differential) PCI-busmastering adapter
that functions as the interface between a SCSI bus and a PC’s PCI local bus. The
Adapter supports all kinds of peripherals compatible with SCSI-1, SCSI-2, Fast
SCSI, Ultra SCSI, or Ultra2 SCSI (LVD), including I/O devices such as SCSI
scanners and storage media such as hard-disk, CD-ROM, MO, tape, and removable
drives.
2.1 Features
• PCI 2.1 compliance. The Adapter meets all the latest electrical, mechanical,
and protocol specifications for the PCI bus.
• Full SCSI compliance. The Adapter is fully Ultra2 SCSI compliant, supporting
advanced features such as tag queueing, sync/async transfers, and
disconnect/reselect arbitration.
• Plug-and-Play support. The Adapter’s onboard ROMs can handle installation,
configuration, and booting without requiring user intervention.
• Use of only one system IRQ. The Adapter doesn’t hog your system’s limited
resources.
• 32-bit data transfers between the Adapter and the host PC at up to
133 megabytes per second in PCI burst mode. The PCI bus is a 32-bit bus;
when it runs synchronously at 33 MHz, the Adapter achieves a peak sustainable
operating speed of 133 MB per second.
• Regular (synchronous) SCSI data rates up to 80 megabytes per second, and
asynchronous SCSI data rates up to 10 megabytes per second.
• Compatible with all types of standard SCSI peripherals. Hard drives, CD-ROM
drives, tape drives, printers, scanners—it doesn’t matter what types of periph-
erals you want to hook to the Adapter. As long as they’re compliant with Ultra2
SCSI (LVD), Ultra SCSI, Fast SCSI, SCSI-2, or SCSI-1, they should work.
• Support for hard-drive capacities up to 8 GB. With the Adapter, MS-DOS
®
hard-disk limitations can be extended from 1 GB to 8 GB.