Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Patent
1998-05-29
2000-08-08
Mai, Tan V.
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
708620, G06F 700, G06F 752
Patent
active
061015229
ABSTRACT:
There is provided is a product-sum calculation circuit which can be constructed of a ROM having a small capacity. In this product-sum calculation circuit, when multiplier selection signals A0 through A2 select X as a multiplier, a second selector circuit 103 selects a product Ck.times.X obtained by multiplying a multiplicand Ck by the multiplier X and outputs the same to an output control circuit 104. In this case, the output control circuit 104 outputs the product Ck.times.X without shifting the same. When the multiplier selection signals A0 through A2 select (2.sup.n)X as the multiplier, the second selector circuit 103 selects the product Ck.times.X obtained by multiplying the multiplicand Ck by the multiplier X and outputs the same to the output control circuit 104 similar to the case where the multiplier X is selected. In this case, the output control circuit 104 outputs (2.sup.n)-fold value of (Ck.times.X) by shifting leftward the product Ck.times.X by n bits. Therefore, merely by storing (Ck.times.X) in a data storage circuit 102, a (2.sup.n)-fold output of (Ck.times.X) can be obtained.
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patent: 4566075 (1986-01-01), Guttag
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patent: 4709343 (1987-11-01), Van Cang
patent: 5255216 (1993-10-01), Blanz et al.
patent: 5262973 (1993-11-01), Richardson
Mai Tan V.
Sharp Kabushiki Kaisha
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