LSI U160 - Manual (Page 19)

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Benefits of LVDlink Technology 1-7
1.5 Benefits of LVDlink Technology
To support greater device connectivity and a longer SCSI cable, the
LSIU160 features LVDlink technology, the LSI Logic implementation of
Universal LVD SCSI. LVDlink transceivers provide the inherent reliability
of differential SCSI, and a long-term migration path to faster SCSI
transfer rates.
The LVDlink transceivers reduce the power needed to drive the SCSI
bus, so that the I/O drivers can be integrated directly into the chip.
LVDlink technology lowers the amplitude of noise reflections and allows
higher transmission frequencies.
The LVDlink transceivers operate in LVD and SE modes. They also allow
the chip to detect a High Voltage Differential (HVD) signal when the chip
is mistakenly connected to external HVD transceivers. When connected,
the LSI53C1010 automatically detects the signal type, based on the
voltage detected. It automatically switches to the SE or LVD mode, as
appropriate.
Important: All bus devices must be LVD or SE. If a HVD device is
detected, the board puts the SCSI bus in the high
impedance state and shuts down.
1.6 Benefits of TolerANT
®
Technology
The LSI53C1010 features TolerANT technology, which includes 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
eliminate double clocking of data which is the single biggest reliability
issue with SCSI operations. TolerANT input signal filtering is a built-in
feature of the LSI53C1010 and all LSI Logic Fast SCSI, Ultra SCSI,
Ultra2 SCSI, and Ultra160 SCSI devices.