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Display system having extended raster operation circuitry

  • US 4,799,056 A
  • Filed: 04/08/1987
  • Issued: 01/17/1989
  • Est. Priority Date: 04/11/1986
  • Status: Expired due to Term
First Claim
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1. A display system comprising:

  • a frame buffer for storing information representing one or more images, said information being organized into a plurality of memory planes;

    a display device for visually displaying images stored in said frame buffer;

    an extended raster operation circuit for performing logical operations on information in the frame buffer and for storing the results of the logical operations in the frame buffer; and

    a controller for controlling the extended raster operation circuit;

    characterized in that the extended raster operation circuit comprises;

    an intraplane operation unit for performing intraplane logical operations specified by the controller on information in the frame buffer, each intraplane logical operation having at least one input operand and at least one output result, all operands and results of a given intraplane logical operation being in a single memory plane; and

    an interplane operation unit for performing interplane logical operations specified by the controller on the results of the intraplane logical operations, each interplane logical operation having at least one input operand and at least one output result, the operands and results of a given interplane logical operation being in at least two memory planes.

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