Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
2005-10-26
2009-08-18
Abraham, Esaw T (Department: 2112)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
C714S781000, C714S801000
Reexamination Certificate
active
07577896
ABSTRACT:
The present invention discloses an apparatus and method for performing cyclic redundancy check (CRC) on partial protocol data units (PDUs). The disclosed apparatus is designed to off-load the CRC calculation for transmit or receive from a host computer. According to the disclosed method, when generating CRC for partial PDUs, for each such PDUs a decision is made to determine whether a CRC action is required, i.e., if CRC should be calculated, checked or placed in the outgoing byte stream. When partial CRC calculation is performed the intermediate value is saved into memory and later is used for calculating the CRC for a consecutive partial PDU. In accordance with a preferred embodiment of the invention, the need to re-calculate the CRC in a case of a re-transmit request is eliminated.
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Leichty Phil L.
Plotz Kevin G.
Uzrad-Nali Oran
Abraham Esaw T
Alphonse Fritz
Brocade Communications Systems, Inc.
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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