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Variable pixel depth and format for video windows

  • US 5,608,864 A
  • Filed: 04/29/1994
  • Issued: 03/04/1997
  • Est. Priority Date: 04/29/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for generating a display, comprising:

  • a memory array having a single address bus, a single data bus, and a single memory controller,said memory array storing an image as pixel data, said image including first pixel data having a first predetermined pixel depth, and second pixel data having a second predetermined pixel depth, said first pixel data representing a first portion of said image and said second pixel data representing a second portion of said image;

    register means coupled to said single memory controller for storing location data representing a location of said second portion of said image within said image, said location data comprising at least a horizontal location defined by a number of fetches required from said memory to retrieve a scan line of said first portion of said image abutting said second portion of said image;

    a first FIFO, coupled to said memory array, for receiving said first pixel data;

    a second FIFO, coupled to said memory array, for receiving said second pixel data having pixel depth different from pixel depth of said first pixel data; and

    control means, coupled to said memory array, said register means, said first FIFO, and said second FIFO, for receiving said location data, controlling said memory array to perform a number of fetches of first pixel data as indicated by said horizontal location data, from said memory array to said first FIFO, and fetching subsequent second pixel data from said memory array to said second FIFO.

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