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Logic Check In Controller Disclosure Number: IPCOM000067163D
Original Publication Date: 1979-Jun-01
Included in the Prior Art Database: 2005-Feb-20

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Hodges, P Erickson, WC [+details]


In a controller, control words having a given number of bits are stored in a read-only storage (ROS). A small number of these bits are used for error detection by checking parities over selected bits of the control word. Each bit from the ROS is included in some parity check, enabling a check of the entire word for single bit errors. Multiple parity bits may be used for detection of multiple bit errors. To detect errors in address inputs and decoding, address parity is included in the control word parity.