Acyclic cable bus having redundant path access

Details Acyclic cable bus having redundant path access Acyclic cable bus having redundant path access

1994-09-27

2000-09-05

Sheikh, Ayaz R.

Electrical computers and digital data processing systems: input/

Intrasystem connection

709238, 709243, 370282, 370419, G06F 1300

Patent

active

061157643

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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patent: 5424657 (1995-06-01), Van Brunt et al.
"IEEE Standard for a High Performance Serial Bus", The Institute Of Electrical And Electronic Engineers, Inc., Draft 7.1v1, IEEEP1394, Aug. 5, 1994.
Marazas, et al., "Information Technology--SCSI-3 Serial Bus Protocol (SBP)", X3T10 992D, Rev. 18, Working Draft, Aug. 11, 1994.

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