Method and apparatus for generating CRC/parity error in network environment
US7000170B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2003 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Jun 25, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/66
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.