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. 17, 2003
Filed:
Jan. 14, 2000
Charles Y. W. Leung, Markham, CA;
Minghua Zhu, North York, CA;
David Y. K. Ho, Thornhill, CA;
David Chih, Scarborough, CA;
ATI International SRL, Christchurch, BB;
Abstract
A FIFO memory device, FIFO control method and graphics processing system are disclosed which incorporate spread-spectrum EMI compensation. In one embodiment, a FIFO memory device and method includes generating a spread-spectrum adjustment signal for a spread-spectrum FIFO based on an address offset associated with a read and write address associated with a spread-spectrum FIFO. The method includes adjusting the spread-spectrum clock signal in response to the spread-spectrum adjustment signal based on the address offset associated with the read and write address. A spread-spectrum FIFO receives data from a data source, such as a graphics data source, which may include a memory such as a RAMDAC. The data can be provided by a display engine or other suitable information provider. The spread-spectrum FIFO is operatively responsive to both a spread-spectrum clock signal and another clock signal to suitably adjust an output frequency of data read from the spread-spectrum FIFO using fewer than two complete display paths and associated circuitry and operations.