LSI53C141 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – SCSI LVD BUS EXPANDER

LSI53C141
SCSI LVD BUS EXPANDER
SCSI LVD BUS EXPANDER OVERVIEW
SCSI bus expanders are the way servers are clustered. A SCSI bus
expander couples bus segments together without any impact to the SCSI
protocol, software, or firmware. The LSI53C141 SCSI Bus Expander attaches
single-ended (SE) SCSI peripherals to the Low Voltage Differential (LVD)
signaling bus used by Ultra2 SCSI.
The LSI53C141 enables system architects to take advantage of the inher-
ent cable distance, device connectivity, and data reliability benefits of LVD
signaling while operating with peripherals designed for Ultra SCSI speeds.
The LSI53C141 operates in two modes: single-ended to single-ended
(repeater) or single-ended to Low Voltage Differential (converter). For
applications requiring SE to High voltage Differential (HVD), the LSI53C120
Bus Expander should be used.
In both SCSI bus repeater and converter modes, cable segments are
electrically isolated from each other. This feature maintains the signal
integrity of each cable segment. For bus isolation applications, the
LSI53C141 is ideally suited for the LSI53C895 Ultra2 SCSI controller.
The LSI53C141 provides additional control capability through the pin
level electrical isolation mode. This feature allows logical disconnection of
both the A side bus and B side bus without disrupting SCSI transfers currently
in progress. For example, devices on the logically disconnected B side can
be swapped out while the A side bus remains active.
The LSI53C141 is based upon bus expander technology resulting in
some signal filtering and retiming to maintain signal skew budgets. In addition,
the LSI53C141 has no programmable registers, therefore it does not require
any software.
FEATURES
• Attaches single-ended SCSI
devices to a Low Voltage
Differential (LVD) SCSI bus
• Operates as a SCSI bus
converter or repeater
• Provides SCSI bus electrical
isolation for high availability
and scalable server clustering
technologies
• Targets and initiators can be
located on either the A or B
side of the device
• Via the pin level electrical
isolation mode, each side of
the device can be logically
disconnected from the other
• Dynamic mode switching used
to inform initiators of a
transmission mode change
• Self-calibration mode supports
variations in voltage, temperature,
and silicon process
• Accepts my asynchronous or
synchronous transfer speed up
to Ultra SCSI