Spread spectrum FIFO and method for storing data for multiple display types
US6580432B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2000 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Jan 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/1423
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.