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:
Jan. 06, 2004
Filed:
Dec. 23, 1999
DeForest Tovey, Los Gatos, CA (US);
ATI International, SRL, , BB;
Abstract
A method and apparatus for determining a byte select vector for a crossbar shifter include processing that begins by storing data in a first set of byte locations and in a second set of byte locations. Typically, a data operand is written into the first and a shift value is written into the second set of byte locations. The processing continues by obtaining a shift amount value for the data. The processing then continues by determining, for each byte multiplexor of a set of byte multiplexors associated with a corresponding output byte, whether a wrapped condition will occur based on the shift amount for the data. When the wrap condition occurs, a wrap shift amount is determined based on a mode of shifting. The processing then continues by generating a byte select vector for the set of byte multiplexors based on the wrap shift amount and the shift amount. The byte select vector includes a first nibble that is associated with a first one of the byte multiplexors and a second nipple that is associated with a second one of the byte multiplexors.