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Selective Address Compare

IP.com Disclosure Number: IPCOM000039702D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01

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Jonas, B [+details]


This article relates to an improvement to the address compare function which allows any instruction in a program which erroneously modifies an area to be found. When wrong data is randomly set on a given area, for example, once a week, it is difficult to find the guilty instruction using the conventional address compare function. In a program, some memory areas, for example, the code, the tables or constants, must not be corrupted in any case. The address compare is a hardware tool which allows any instruction which wrongly modifies those areas to be detected. Other areas, for example, control blocks, dynamic tables, or save areas, are permanently modified. In that case, if an abnormal modification occurs, for example, one or several bits are ON or OFF once in a while, the hardware tool alone is unusable.