Boots – shoes – and leggings
Patent
1987-04-29
1988-07-05
Malzahn, David H.
Boots, shoes, and leggings
G06F 752
Patent
active
047559624
ABSTRACT:
A modified Booth algorithm is implemented in the arithmetic logic of the ALU data path to cut the number of cycles to do a multiply in half thereby improving execution time of the multiplication operation. A Booth Encoder examines the two least significant bits of the multiplier stored in the Q2 register and the bit which was previously shifted out on the last partial product shift cycle. Based upon the status of these three bits, the Booth Encoder causes the ALU to add or substract one times the multiplicand to the contents of the partial product register and shift twice, add or substract two times the multiplicand to the contents of the partial product register and shift twice, or do nothing but shift twice. A pre ALU B shifter provides a single left shift of the multiplicand to provide the multiplication by two when same is necessary.
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Mick et al., "Single-Chip Multiplier Expands Digital Role in Signal Processing", Electronics, May 13, 1976, pp. 103-108.
Fairchild Camera and Instrument
Fish Ronald C.
Malzahn David H.
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