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Abstract

A method and apparatus for synchronizing pixel data flow within a memory display interface (MDI) to enable variable pixel depths, and to support display devices requiring differing pixel rates. A clock circuit receives a pixel clock from a DAC, and generates a shift clock (VSCLK), a pipeline clock, and an input control signal, all of which are synchronized to the pixel clock. The pixel clock synchronizes color pixel data transfer from the MDI to the DAC. The pipeline clock synchronizes pixel data processing through a pixel processing pipeline according to the frequency of the pixel clock and the number of pixels processed in parallel through the pixel processing pipeline. The input control signal feeds the pixel data from a VRAM frame buffer into the pixel processing pipeline according to the pixel depth mode, the frequency of the pixel clock, and the number of pixels processed in parallel through the pixel processing pipeline. The VSCLK controls pixel data transfer from the VRAM frame buffer over the video bus according to the pixel depth mode and the frequency of the pixel clock.

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First Claim