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    • 4. 发明授权
    • High speed RAMDAC with reconfigurable color palette
    • 高速RAMDAC,具有可重构的调色板
    • US5442379A
    • 1995-08-15
    • US92033
    • 1993-07-15
    • Robert A. BruceAlbert XthonaDan Moss
    • Robert A. BruceAlbert XthonaDan Moss
    • G09G5/06G09G1/28
    • G09G5/06
    • A method and apparatus for generating both a true color and fast pseudo color video signals includes the combination of first and second commercially available RAMDACs. Parallel video data representing the red, blue, and green color components of one or more pixels is provided on a video bus to the inputs of the first and second RAMDACs. A first data portion of the parallel video data is presented to the input of the first RAMDAC, which can represent either a single pixel in the fast pseudo color mode or the most significant pixel data. A second data portion of the parallel video data is presented to the input of the second RAMDAC, which can represent either another single pixel in the fast pseudo color mode or the least significant pixel data. The outputs of the two RAMDACs are combined to provide true color video signals in a first RAM programming mode, and the respective outputs of the two RAMDACs are multiplexed to provide fast pseudo color video signals in a second RAM programing mode.
    • 用于产生真彩色和快速伪彩色视频信号的方法和装置包括第一和第二市售RAMDAC的组合。 表示一个或多个像素的红色,蓝色和绿色分量的并行视频数据在视频总线上提供给第一和第二RAMDAC的输入。 并行视频数据的第一数据部分被呈现给第一RAMDAC的输入,其可以表示快速伪彩色模式中的单个像素或最高有效像素数据。 将并行视频数据的第二数据部分呈现给第二RAMDAC的输入,该RAMDAC可以代表快速伪彩色模式中的另一单个像素或最低有效像素数据。 两个RAMDAC的输出被组合以在第一RAM编程模式中提供真彩色视频信号,并且两个RAMDAC的相应输出被多路复用以在第二RAM编程模式中提供快速伪彩色视频信号。