Time multiplexing pixel frame buffer video output

Details Time multiplexing pixel frame buffer video output Time multiplexing pixel frame buffer video output

1995-03-21

1997-12-09

Hjerfe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

345185, 345199, G09G 504

Patent

active

056965346

ABSTRACT:
A method and for multiplexing pixel data from a frame buffer to a RAMDAC to reduce the number of pins required. For many graphics operations optimal performance is achieved by storing an entire 32-bit pixel in a single RAM chip. When displaying video data from a frame buffer, pixels must be read out serially from the frame buffer at real-time speeds. A frame buffer memory with 16 pins for serial video output is used. An entire 32-bit pixel is stored in a single RAM chip. For a 32-bit pixel containing four byte (8-bit) quantities designated X, B, G and R, on the first clock cycle, the X and B bytes are made available on the 16 pins of the frame buffer. On the next clock cycle, the G and R bytes are made available. Thus, over two cycles the entire 32-bit pixel is output from the frame buffer to a RAMDAC which samples the X and B bytes on 16 input pins. The RAMDAC stores these X and B bytes in an internal register. On the next clock cycle it samples the G and R bytes. The DAC then reassembles the X, B, G and R bytes into a single 32-bit pixel for conversion into video. In this manner, 32-bit pixels are communicated across a 16-bit pixel data bus.

REFERENCES:
patent: 4704605 (1987-11-01), Edelson
patent: 4769632 (1988-09-01), Work et al.
patent: 4827255 (1989-05-01), Ishii
patent: 4894653 (1990-01-01), Frankenbach
patent: 5230064 (1993-07-01), Kuo et al.
patent: 5251298 (1993-10-01), Nally
patent: 5289565 (1994-02-01), Smith et al.
patent: 5436641 (1995-07-01), Hoang et al.
patent: 5440682 (1995-08-01), Deering
patent: 5510843 (1996-04-01), Keene et al.
patent: 5544306 (1996-08-01), Deering et al.

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