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A double error detection/single error correction (DED/SEC) optimum and symmetrical Hamming Code has been developed that provides package error detection for a 4-bit memory package.
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Symmetrical Odd Weight (39,32) DED/SEC Code With Package Error
A double error detection/single error correction (DED/SEC) optimum and
symmetrical Hamming Code has been developed that provides package error
detection for a 4-bit memory package.
In a Hamming Code, parity bits are formed on different groups of data bits so
that an error in a data bit produces a pattern of syndrome bits that identifies the
error so that it can be corrected by inverting the bit. The syndrome bits show a
change in the original check bits formed during a store operation and the new
check bits formed during fetch on the word that may be in error. In an odd-
weight code, an even number of syndrome bits (except zero) signifies a double
error. These codes are frequently used with data patterns having fewer than the
maximum number of bits so that some additional errors can also be detected. It
is advantageous to arrange for all of the errors in a single module or package to
In a symmetrical code two identical encoding modules, each implementing
one half of the ECC (error correction code) matrix, can be used together with an
interconnection scheme which combines the partial syndrome bits generated by
each module in a further exclusive-OR function to give the check bits to be stored
or the syndrome bits for error decoding. All of the duplicated components are
identical, and only the interconnections differentiate the two halves of the circuit.