Avago Technologies LSI53C320 - Manual (Page 16)

1-6 Introduction
Version 2.2 Copyright © 2003 by LSI Logic Corporation. All rights reserved.
1.4 Benefits of SureLINK™ (Ultra320 SCSI Domain Validation)
SureLINK Domain Validation is a procedure that allows a host computer
and target SCSI peripheral to negotiate and find the optimal transfer
speed. This procedure improves overall reliability of the system by
ensuring data integrity.
Domain Validation software ensures robust SCSI interconnect
management and low risk Ultra320 SCSI implementations by extending
the domain validation guidelines documented in the SPI-4 specifications.
Domain validation verifies that the system is capable of transferring data
at Ultra320 SCSI speeds, allowing the LSI53C320 to renegotiate to a
lower data transfer speed and bus width if necessary. SureLINK Domain
Validation is the software control for the domain validation manageability
enhancements in the LSI53C320. SureLINK Domain Validation software
provides domain validation management at boot time as well as during
system operation.
SureLINK Domain Validation ensures robust system operation by providing
three levels of integrity checking on a per-device basis: Basic (Level 1) with
inquiry command; Enhanced (Level 2) with read/write buffer; and Margined
(Level 3) with margining of drive strength and slew rates.
1.5 Benefits of LVDlink™ Technology
The LSI53C320 supports LVDlink technology for SCSI, a signaling
technology that increases the reliability of SCSI data transfers over
longer distances than those supported by SE SCSI technology. The low
current output of LVD allows the I/O transceivers to be integrated directly
onto the chip. For backward compatibility to existing SE devices, the
LSI53C320 features multimode LVDlink transceivers that can switch
between LVD and SE modes.
Some features of integrated LVDlink transceivers are listed below:
•
supports SE or LVD modes
•
allows greater device connectivity and longer cable length
•
saves the cost of external differential transceivers
•
provides a long-term performance migration path