Method and apparatus for generating CRC/parity error in...

Details Method and apparatus for generating CRC/parity error in... Method and apparatus for generating CRC/parity error in...

2006-02-14

2006-02-14

Chase, Shelly (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S700000

Reexamination Certificate

active

07000170

ABSTRACT:
A method and apparatus for generating a CRC (cyclic redundancy check)/parity error in network environment. A SCSI (small computer systems interface) bus expander such as an Ultra320 bus expander or the like is added between a sending device and a receiving device. The sending device-receiving device pair may execute a training session to determine the skew compensation. During the training session, the SCSI bus expander may figure out timing differences due to skew and adjusts the timing of each data signal to compensate for skew. For each data signal, a compensated time may be obtained. The compensated time may then be modified through a JTAG (Joint Test Action Group) port of the SCSI bus expander. The compensated times may be adjusted such that a CRC/parity error is generated on every I/O (input/output) or just some I/Os to the receiving device. By intentionally generating a CRC/parity error, the response of the devices in the SCSI environment to a CRC/parity error may be evaluated during an input/output (I/O) test.

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Arellano et al. Ultra320 SCSI: New Technology-Still SCSI Written for the SCSI Trade Association by Adaptec, Inc., Mar. 20001, SCSI Trade Association, www.scsita.org, p. 1-7.

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