Ultra320 SCSI - Page 1

Source: Adaptec

- Introduction

SCSI celebrates its 20th anniversary with a bang by moving to the seventh generation of the bus that introduces a maximum data transfer at a staggering 320 MB/sec. Over the course of the past two decades the protocol has evolved from an 8-bit, single-ended interface transferring data at 5 MB/sec to a 16-bit, differential interface transferring data at 160 MB/sec. For the first time the SCSI protocol has been revised in order to reduce the time spent on processing overhead, resulting in increased performance. Ultra320 SCSI launched at end of 2001.

The Three electrical levels of SCSI:

SE=Single Ended
HVD SCSI or Differential SCSI=High voltage differential SCSI, based on EIA485
LVD SCSI=Low voltage differential SCSI