Acyclic cable bus having redundant path access
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United States of America Patent
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-
Sep 5, 2000
Grant Date -
N/A
app pub date -
Sep 27, 1994
filing date -
Sep 27, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A novel PHY concentrator design is disclosed. The PHY concentrator provides switchable dual paths to disk drives from dual controllers. The concentrator uses a common input that is shifted into an internal shift register during the bus reset state and uses an individual TpBias source for each TPA port connection, instead of a common one for all ports. An external shift register can be loaded with an odd/even pattern or a half-on/half-off pattern, which controls the individual TpBias source for each TPA port. The concentrator prevents closed loop conditions from occurring when a pair of concentrators are used to build an array of devices, such as a RAID structure.
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