The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1988
Filed:
Dec. 27, 1984
Tatsuya Sakai, Hadano, JP;
Sakou Ishikawa, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A high-speed dividing apparatus includes a first, second and third carry save adders (CSA's) and the outputs of the first CSA are connected to the inputs of the second and third CSA's. The first CSA is capable of carrying out either the addition or the subtraction of a divisor. The second CSA is adapted to carry out the subtraction of a divisor, and the third CSA the addition thereof. A carry look-ahead logic is connected to each CSA. A quotient determining logic is adapted to determine quotient bits in response to outputs from CSA's and carry look-ahead logics. A selector control logic is adapted to control selectors in response to quotient bits so that outputs from one of the second and third CSA's and either a divisor or the complement thereof are selectively supplied to the inputs of the first CSA. An arbitrary number of stages can be arranged in a binary tree configuration in the same manner.