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摘要：先容了基于FPGA的图形式LCD&VGA控制器的设计，具体讨论了用VHDL设计行场扫描时序的方法，这种设计方法稍作改动便可产生任意行场扫描时序，具有很好的可重用性。该控制器已成功地在某型飞机座舱图形显示系统中使用。s0100
    
关键词：仪表装置LCDVHDLFPGAVGA
    
飞机座舱图形显示系统已发展到第六代，即采用有源矩阵彩色液晶显示器AMLCD（ActiveMatrixLiquidCrystalDisplay）。当前高分辨率的AMLCD显示模块还只能依靠进口，且控制电路板须安装在该显示模块提供的机箱内。这种安装方式对AMLCD控制电路板的尺寸要求高，要求尽可能减少所设计电路板的尺寸。在笔者设计的新一代飞机座舱图形显示系统中使用了大规模现场可编程门阵列FPGA（FieldProgrammableGataArray），这种设计方式可以将以前需要多块集成芯片的电路设计到一块大模块可编程逻辑器件中，大大减少了电路板的尺寸，增强了系统的可靠性和设计的灵活性。本文具体先容了已在实际项目中应用的基于FPGA的图形式AMLCD控制器设计，这种设计方法稍作修改即可应用于常见VGA视频接口电路的设计。
    
1.图形显示系统简介
  
是飞机座舱图形显示系统结构框图。图中处理器采用AD公司的ADSP21061芯片，AMLCD采用Korry公司的KDM710全彩色液晶显示模块，该模块为5×5英寸、600×600分辨率彩色液晶显示模块，24位数字RGB输进。两个帧存A和B采用IDT公司的71V424高速异步静态RAM，系统采用两个帧存轮流操纵的方法：当DSP向其中一个帧存写象素时，由FPGA构成的帧存控制器将另一个帧存中的象素顺序读出送给AMLCD，反之亦然。图形显示系统通过IDT公司的71V04双口RAM接收主机的显示信息。图1中的帧存控制器和视频控制器由Xilinx公司的SpartanII芯片XS2S50实现。
    
2.KMD710显示模块
    
美国Korry公司提供的KDM710全彩色液晶显示模块接口信号主要如下几组：3个8位RGB数字信号、行同步信号HSYNC、场同步信号VSYNC、数据使能信号DATA_EN和点时钟输进DCLK。根据AMLCD数据手册所需求的时序，确定扫描时序和相应的时序参数如图2所示。一般，图形终端显示器扫描制式与广播电视的标准有点不同，须根据显示模块所提供的时间要求来确定扫描时序，其中的行场同步的前后肩，可以根据需要进行微调，一般为了防止每行的*个象素丢失，要求行同步后肩C与行同步脉冲宽B尽量相等。图2中的点时钟为20MHz，行周期为650个时钟周期，场周期为615个行周期（场频为50Hz
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