Decimal arithmetic apparatus and method
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United States of America Patent
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Apr 28, 1998
Grant Date -
N/A
app pub date -
Apr 26, 1996
filing date -
May 27, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for adding two BCD numbers, avoids the need for special adders with detection of carries between BCD digits. First, a sum without carries is generated, by forming the binary sum of the two numbers and an all-sixes pattern, without any carries between BCD digits. Next, a sum with carries is generated, by forming the binary sum of the two numbers and an all-sixes pattern, with carries between BCD digits. A mask pattern is then generated, comprising a six in each BCD digit where the sum without carries is unequal to the sum with carries. A result is then generated by forming the binary sum of the two numbers and the mask pattern, with carries between BCD digits.
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