Fault isolation through no-overhead link level CRC

Details Fault isolation through no-overhead link level CRC Fault isolation through no-overhead link level CRC

2007-04-24

2007-04-24

Chung, Phung My (Department: 2138)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S758000, C714S807000, C714S819000

Reexamination Certificate

active

10468996

ABSTRACT:
A fault isolation technique for checking the accuracy of data packets transmitted between nodes of a parallel processor. An independent crc is kept of all data sent from one processor to another, and received from one processor to another. At the end of each checkpoint, the crcs are compared. If they do not match, there was an error. The crcs may be cleared and restarted at each checkpoint. In the preferred embodiment, the basic functionality is to calculate a CRC of all packet data that has been successfully transmitted across a given link. This CRC is done on both ends of the link, thereby allowing an independent check on all data believed to have been correctly transmitted. Preferably, all links have this CRC coverage, and the CRC used in this link level check is different from that used in the packet transfer protocol. This independent check, if successfully passed, virtually eliminates the possibility that any data errors were missed during the previous transfer period.

REFERENCES:
patent: 5517508 (1996-05-01), Scott
patent: 5802080 (1998-09-01), Westby
patent: 07-235880 (1995-09-01), None

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