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. 25, 1990
Filed:
Mar. 04, 1988
Edward P Hutchins, San Jose, CA (US);
Chips and Technologies, Inc., San Jose, CA (US);
Abstract
The present invention provides a fast bit blitter method and circuit which uses less logic than do prior art bit blitter circuits. A circuit built in accordance with the present invention includes four main components each of which only has as many bit positions as does the data bytes that are being shifted. The four main components are a storage register, a multiplexer bank, a multiplexer selector and a barrel shifter. As data words are serially read out of memory, they are temporarily stored in the register. The multiplexer gates selected bit from the word stored in the register, together with selected bits from the next word that appears on the data bus to the barrel shifter. The barrel shifter does the appropriate shifting. Alternatively, the barrel shifter can be located before the multiplexer in the data path. The amount of time required to shift an image using the present invention is approximately the same amount of time required with the prior art, however, the amount of hardware required is substantially less.