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本文介绍的两行存贮器及输出组件是一种简便的图象处理用显示设备,它能完成如下功能: 甲行缓冲存贮器在电视扫描第一行的64微秒内,写入计算机DMA(直接数据通道)送来的第一行128个4比特象素数据,然后在第二行扫描的前25.6微秒内读出这些象素数据。乙行缓冲存贮器在第二行扫描的64微秒内写入计算机DMA输给它的第二行128个象素数据,然后在第三行扫描的前25.6微秒内读出,同时,甲行又写入第三行的128个象素。甲乙两行存贮器交替完成慢写快读功能,可以把存于计算机的部分图象信息(128×256个象素数据)读出并输给数模转换器。于是,计器机DMA送来的图象数字信息转变成连续的电视模拟信号,以供显示。
This article describes two lines of memory and output components is a simple display device for image processing, it can accomplish the following functions: A buffer memory in the first line of television scanning within 64 microseconds, written to the computer The first 128 lines of 4-bit pixel data sent from the DMA (Direct Data Channel) are then read out in the first 25.6 microseconds of the second line of the scan. The line B buffer stores the second 128 lines of pixel data that the computer DMA lost to it in 64 microseconds of the second line scan and then reads it in the first 25.6 microseconds of the third line scan, A line and then write the third line of 128 pixels. A and B two lines of memory alternate to complete the slow write fast read function, you can put in the computer part of the image information (128 × 256 pixel data) read out and lost to digital-analog converter. Thus, the digital image data sent by the metering machine DMA into a continuous television analog signal for display.