Avago Technologies LSI53C1020 - Manual (Page 22)

1-8 Introduction
Version 2.4 Copyright © 2001–2004 by LSI Logic Corporation. All rights reserved.
SureLINK Domain Validation provides 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.
1.6 Benefits of LVDlink Technology
The LSI53C1020 supports LVD through LVDlink technology. This
signaling technology increases the reliability of SCSI data transfers over
longer distances than are supported by SE SCSI. The low current output
of LVD allows the I/O transceivers to be integrated directly onto the chip.
To allow the use of the LSI53C1020 in both legacy and Ultra320 SCSI
applications, this device features universal LVDlink transceivers that
support LVD SCSI and SE SCSI.
1.7 Benefits of TolerANT
®
Technology
The LSI53C1020 features TolerANT technology, which provides active
negation on the SCSI drivers and input signal filtering on the SCSI
receivers. Active negation causes the SCSI Request, Acknowledge,
Data, and Parity signals to be actively driven HIGH rather than passively
pulled up by terminators.
TolerANT receiver technology improves data integrity in unreliable
cabling environments where other devices would be subject to data
corruption. TolerANT receivers filter the SCSI bus signals to eliminate
unwanted transitions, without the long signal delay associated with
RC-type input filters. This improved driver and receiver technology helps
ensure correct clocking of data. TolerANT input signal filtering is a built-
in feature of the LSI53C1020 and all LSI Logic Fast SCSI, Ultra SCSI,
Ultra2 SCSI, Ultra160 SCSI, and Ultra320 SCSI devices.
TolerANT technology increases noise immunity, balances duty cycles,
and improves SCSI transfer rates. In addition, TolerANT SCSI devices
do not cause glitches on the SCSI bus at power-up or power-down,
which protects other devices on the bus from data corruption. When used
with the LVDlink transceivers, TolerANT technology provides excellent
signal quality and data reliability in real world cabling environments.