Q-Logic QLA12160 manual Introduction, Product Description, Scsi Data Transfer Rates

Section 1

Introduction

NOTE: This installation guide applies to the following QLogic host adapter boards, collectively referred to as the QLA12160 board unless otherwise noted:

■QLA12160/33 (DC8110402-06)

■QLA12160/66 (DC8110402-07)

The QLA12160 board (wide, low voltage differential [LVD]), dual port, Ultra3, 64-bit PCI) contains the ISP12160A/33 or ISP12160A/66 chip.

1.1

Product Description

The QLA12160 board is an intelligent, high-performance, DMA bus master SCSI host adapter designed for high-end systems. The intelligence and performance are derived from the ISP chip, making the QLA12160 board a high performance host adapter. The ISP chip combines a powerful RISC processor, two SCSI executive processors (SXPs), and a peripheral component interconnect (PCI) local bus interface in a single-chip solution. The QLA12160 board supports bootable devices (hard disk drives and CD-ROM drives) and can be used with tape drives and other SCSI devices. Installation of the QLA12160 board is quick and easy.

The QLA12160 board is for use only with UL listed computers that have detailed instructions for user installation of accessory cards.

The QLA12160 board is designed to operate with multiple data transfer speeds under SCSI specifications (see table 1-1).

Table 1-1. SCSI Data Transfer Rates

SCSI Mode	Maximum Data Rate	Maximum Data Rate
	Narrow (8-bit)	Wide (16-bit)
SCSI (or parallel SCSI)	5 MBps (asynchronous)	—
Fast SCSI	10 MBps	20 MBps
Ultra SCSI	20 MBps	40 MBps
Ultra2, LVD SCSI	40 MBps	80 MBps
Ultra3, LVD SCSI	80 MBps	160 MBps

NOTE: Only single-ended and LVD devices (Ultra2 and Ultra3) can be connected to the QLA12160 board.

DC8151101-00 C 1-1