Parity Error In Double Hash Memory
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Catalyst 6500 Series SwitchesTroubleshoot and AlertsTroubleshooting TechNotes Parity Errors Troubleshooting Guide Download Print Available Languages Download Options PDF (259.4 KB) View with Adobe parity error checking Reader on a variety of devices Updated:Jul 15, 2013 Document ID:116135 parity error fix Document ID: 116135 Updated: Jul 15, 2013 Contributed by Shawn Wargo, Cisco Engineering. Download PDF Print Feedback system returned to rom by processor memory parity error at pc Related ProductsCisco Catalyst 6500 Series Switches ContentsIntroductionBackgroundSoft ErrorsHard ErrorsCommon Error MessagesProcessorRAMASICLatest AdvancementsProcessorRAMASICSoftwareMSFC IBC Reset6700 Series 'Single-Bit Parity Error' ResetRecommendationsSoft Errors (SEU)Environmental AuditLatest Firmware (Rommon)Thumb ScrewsHard Errors (Malfunction)Hardware (MTBF and parity error detected in vram EOL) AuditHardware DiagnosticsRelated Cisco Support Community DiscussionsIntroductionThis document describes soft and hard parity errors, explains common error messages, and recommends methods that help you avoid or minimize parity errors. Recent improvements in hardware and software design reduce parity problems as well. BackgroundWhat is a processor or memory parity error?Parity checking is the storage of an extra binary digit (bit) in
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order to represent the parity (odd or even) of a small amount of computer data (typically one byte) while that data is stored in memory. The parity value calculated from the stored data is then compared to the final parity value. If these two values differ, this indicates a data error, and at least one bit must have been changed due to data corruption.Within a computer system, electrical or magnetic interference from internal or external causes can cause a single bit of memory to spontaneously flip to the opposite state. This event makes the original data bits invalid and is known as a parity error.Such memory errors, if undetected, may have undetectable and inconsequential results or may cause permanent corruption of stored data or a machine crash.There are many causes of memory parity errors, which are classified as either soft parity errors or hard parity errors.Soft ErrorsMost parity errors are caused by electrostatic or magnetic-related environmental conditions.The majority of single-event errors in memory chips are caused by background radiation (such as neutrons from cosmic rays), electromagnetic interf
citations to reliable sources. Unsourced material may be challenged and removed. (August 2008) (Learn how and when to remove this template message) In information theory and coding theory with applications in computer science and telecommunication, error
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detection and correction or error control are techniques that enable reliable delivery of cscut56929 digital data over unreliable communication channels. Many communication channels are subject to channel noise, and thus errors may be introduced during testltlfpoememoryconsistency transmission from the source to a receiver. Error detection techniques allow detecting such errors, while error correction enables reconstruction of the original data in many cases. Contents 1 Definitions 2 History 3 Introduction 4 http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/116135-trouble-6500-parity-00.html Implementation 5 Error detection schemes 5.1 Repetition codes 5.2 Parity bits 5.3 Checksums 5.4 Cyclic redundancy checks (CRCs) 5.5 Cryptographic hash functions 5.6 Error-correcting codes 6 Error correction 6.1 Automatic repeat request (ARQ) 6.2 Error-correcting code 6.3 Hybrid schemes 7 Applications 7.1 Internet 7.2 Deep-space telecommunications 7.3 Satellite broadcasting (DVB) 7.4 Data storage 7.5 Error-correcting memory 8 See also 9 References 10 Further reading 11 External links Definitions[edit] The https://en.wikipedia.org/wiki/Error_detection_and_correction general definitions of the terms are as follows: Error detection is the detection of errors caused by noise or other impairments during transmission from the transmitter to the receiver. Error correction is the detection of errors and reconstruction of the original, error-free data. History[edit] The modern development of error-correcting codes in 1947 is due to Richard W. Hamming.[1] A description of Hamming's code appeared in Claude Shannon's A Mathematical Theory of Communication[2] and was quickly generalized by Marcel J. E. Golay.[3] Introduction[edit] The general idea for achieving error detection and correction is to add some redundancy (i.e., some extra data) to a message, which receivers can use to check consistency of the delivered message, and to recover data determined to be corrupted. Error-detection and correction schemes can be either systematic or non-systematic: In a systematic scheme, the transmitter sends the original data, and attaches a fixed number of check bits (or parity data), which are derived from the data bits by some deterministic algorithm. If only error detection is required, a receiver can simply apply the same algorithm to the received data bits and compare its output with the received check bits; if the values do not match, an error has occurred at some
The Sysmon NP Memory Error Monitoring event monitors memory errors on interface modules. This appendix lists the interface cards that support NP memory error monitoring. It also details the different NP memory errors supported on http://www.brocade.com/content/html/en/administration-guide/netiron-05900-adminguide/GUID-17713269-1F59-4081-BFCB-F9711377B73F.html each interface card. The following interface cards support NP memory error monitoring: BR-MLX-40Gx4-X BR-MLX-10Gx24 BR-MLX-100Gx2-X(100G) Gen-1 NI-XMR-10Gx4 NI-MLX-10Gx4) Gen-1.1 BR-MLX-1GCx24-X BR-MLX-1GFx24-X BR-MLX-10Gx4-X Gen-2 NI-MLX-10Gx8-M NI-MLX-10Gx8-D BR-MLX-10Gx8-X Table 54 NP memory errors supported on BR-MLX-40Gx4-X interface cards External Memory Errors 1 PRAM Parity Errors 2 CAM2PRAM Parity Errors 3 LBLRAM Parity Errors 4 CAM wd10 Parity Error 5 CAM GIO Parity Error 6 CAM PEO Parity Error 7 parity error CAM Operation Parity Error 8 CAM Result Bus Parity Error Internal Memory Errors 1 Tx Deframer MVLAN Flag FIFO Parity 2 Tx Deframer MVLAN control Packet FIFO Parity 3 Tx Deframer MVLAN replication table Parity 4 Tx Deframer MVLAN start offset FIFO Parity 5 Tx Deframer MVLAN sop FIFO Parity 6 Tx Deframer MVLAN payload Data FIFO Parity 7 Tx Packet Edit Data FIFO Parity 8 Tx parity error in Packet Edit Next Hop Table Parity 9 ACL PRAM Results FIFO Parity 10 ACL Data FIFO Parity 11 ACL Control FIFO Parity 12 ACL QoS Done FIFO Parity 13 ACL Port Number FIFO Parity 14 ACL Priet Table Parity 15 ACL Tx VLAN Table Parity 16 Tx Priet Lookup Result Parity 17 MAC0 Frame LSTD Parity 18 MAC0 Frame Data Parity 19 MAC0 Frame Control Parity 20 MAC1 Frame LSTD Parity 21 MAC1 Frame Data Parity 22 MAC1 Frame Control Parity 23 Tx Packet Edit Data FIFO Parity 24 Tx Packet Edit Control FIFO Parity 25 Tx Packet Edit nhlk FIFO Parity 26 Tx Packet Edit pipe LBLe FIFO Parity 27 Start Offset Table CPU Read Parity 28 Replacement Table CPU Read Parity 29 Next Hop Table CPU Read Parity 30 Tx VLAN Table CPU Read Parity 31 Priet Table CPU Read Parity 32 Rx MAC Data FIFO Read Parity 33 Rx MAC Flag FIFO Read Parity 34 Rx MAC Data FIFO Read Parity 35 Rx MAC Flag FIFO Read Parity 36 CAM Result Scheduler FIFO Overflow 37 CAM1 Lookup FIFO3 Overflow 38 CAM1 Lookup FIFO2 Overflow 39 CAM1 Lookup FIFO1 Overflow 40 CAM2 Lookup FIFO3 Overflow 41 CAM2 Lo
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