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:
Dec. 24, 1991
Filed:
Jul. 13, 1990
Noriaki Sakai, Tokyo, JP;
Hiroyuki Arii, Yamanashi, JP;
NEC Corporation, Tokyo, JP;
Abstract
A post-normalizing unit for use in a floating-point arithmetic circuit having a pre-normalizing unit for carrying out a pre-normalization operation on first and second exponent parts and first and second fraction parts to produce a maximum exponent part and first and second pre-normalized fraction parts, an arithmetic unit for carrying out an arithmetic operation on the first and the second pre-normalized fraction parts to produce an operated fraction part, and first and second shift count calculating circuits calculate first and second shift counts for use in normalizing the operated fraction part with an input cardinal number regarded as first and second cardinal numbers, respectively. Supplied with the operated fraction part, first and second shifters left-shift the operated fraction part on the basis of the first and the second shift counts to produce first and second shifted fraction parts, respectively. Supplied with the maximum exponent part, first and second exponent adjusting circuits adjust the maximum exponent part by using the first and the second shift counts to produce first and second adjusted exponent parts, respectively. A result selector selects one of the first and the second shifted fraction parts as a post-normalized fraction part. An exponent adjustment selector selects one of the first and the second adjusted exponent part as a post-normalized exponent part.