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Error-Reporting Registers

IP.com Disclosure Number: IPCOM000040391D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Gayhart, BJ: AUTHOR [+3]

Abstract

Error-reporting registers provide a mechanism for first error capture in an environment where propagated errors and time-out checkers can result in a multiple error recording due to one fault. There are error-reporting registers for each field-replaceable unit (FRU). The error-reporting registers (ERRs) contain the error checkers for that element and take a single-cycle picture of these checkers which is latched up in the ERRs until they are read out and reset by the logic support station (LSS). This level is considered the lowest ERR level. The ERR contents in each TCM are ORed together into one output and sent to the next hierarchic error-reporting register on each board. This ERR covers error checkers from FRUs comprising the next level replace package.

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Error-Reporting Registers

Error-reporting registers provide a mechanism for first error capture in an environment where propagated errors and time-out checkers can result in a multiple error recording due to one fault. There are error-reporting registers for each field-replaceable unit (FRU). The error-reporting registers (ERRs) contain the error checkers for that element and take a single-cycle picture of these checkers which is latched up in the ERRs until they are read out and reset by the logic support station (LSS). This level is considered the lowest ERR level. The ERR contents in each TCM are ORed together into one output and sent to the next hierarchic error-reporting register on each board. This ERR covers error checkers from FRUs comprising the next level replace package. The ERR takes a single-cycle picture of these lines on the first detected error and latches the lines up until they are read out and reset by LSS. This level of ERR is considered a higher ERR level. The analysis routine looks at the contents of the highest ERR level to determine the first active error-reporting source for the next lower ERR level, and so on down the ERR levels. The last level is used to find the error checker that first detected the error. The domain of this checker determines the FRU call. Forwarding travel time for all signals into a given ERR level must be the same for an accurate FRU call. The ERRs have an encoding to detect if more than one error checker comes on...