Saturable carry-save adder
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United States of America Patent
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Apr 4, 1989
Grant Date -
N/A
app pub date -
Jul 9, 1986
filing date -
Jul 12, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A carry-save adder for a bit-parallel addition of binary numbers in two's complement form incorporates a series of first adders for forming intermediate sum and carry words which are combined in an adder means to form a sum word. A decoder is provided for recognizing saturation of the carry-save adder and for generating overflow signals in dependence on the two most significant bits of the intermediate sum and carry words. When the overflow signals are generated, the recursive circuit branches are disconnected and saturation intermediate sum and carry words are substituted for the intermediate sum and carry words which yield sum words which do not exceed the permissible adder content.
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