| 摘要 |
The difference between the tetrad adder according to the invention and the tetrad adder according to P 3536725.3 is that a partial summand derivation circuit, which derives a partial summand with the value 5 if two partial summands with the value 2 are present and there is also a carry with the value 1 to be processed, is also arranged at the start of the main circuit (1). This tetrad adder thus has a partial summand derivation circuit for the value 5 at both the start and the end of the main circuit (1). Circuit (2) is a code conversion circuit to convert decimal code into 5211 code up to the value 4. <IMAGE>
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