Avago Technologies LSI21040 - Manual (Page 16)

3.75 pc 10.25 pc 11.25 pc 38.25 pc
4.333 pc
48.583 pc
52.5 pc
34.5 pc
44.25 pc
1-6 Using the LSI21040
1.3.4 Asynchronous Information Protection (AIP)
The LSI53C1010 supports AIP to protect all non-data phases, including
command, status, and messages. CRC, along with AIP, provides end-to-
end protection of the SCSI I/O.
1.4 Benefits of LVD Link Technology
To support greater device connectivity and a longer SCSI cable, the
LSI21040 features LVD Link technology, the LSI Logic implementation of
Universal LVD SCSI. LVD Link transceivers provide the inherent reliability
of differential SCSI, and a long-term migration path to faster SCSI
transfer rates.
The LVD Link transceivers reduce the power needed to drive the SCSI
bus, so that the I/O drivers can be integrated directly into the chip.
LVD Link technology lowers the amplitude of noise reflections and allows
higher transmission frequencies.
The LVD Link 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 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.
1.5 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.