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公司名:厦门莫格电气自动化有限公司
联系人:雷琳
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图形显示控制器(GDC)是位于车辆信息和娱乐系统中心的关键引擎,通常这些信息娱乐系统包括需要各类人机接口的头端单元和全配置的各种仪器。开始为日本和欧洲市场上的高端车辆中的导航系统设计的图形显示控制器,现在已经出现在世界各地的各种型号的中档乃至低端车辆中。在车辆的娱乐系统中也在采用。
车辆GDC是一款的器件,它整合了车辆娱乐系统中所需的很多功能。GDC的基本功能是控制LCD面板,并产生宽范围的丰富图像内容。GDC可以实现的功能,如导航,模拟仪表的表征,振动斑点屏蔽(vibrant splash screens)以及在不占用主CPU过多资源的条件下其他的更生动体验等。此外,GDC还完率治理,这使得可以省往一些外部的冷却部件,例如风扇或散热器。
与台式电脑图形控制器不一样,为嵌进式应用设计的GDC用于低分辨率的小屏幕应用。汽车显示器的分辨率通常从基本信息显示所用的CIF(320×240)到仪器所用的Ultra Wide VGA(1024?480)。由于车辆中复杂环境,需要在这些小屏幕上显示大量的信息,并且要求显示清楚,从而带来了一些特殊的挑战。GDC选用多层和多种透明度,使得观看者能够同时观看几个屏幕。与Windows工作台系统类似,屏幕尺寸需要调整和移动显示区域。GDC将答应从屏幕或图像的下方观看,从而改善显示效果。
GDC性能分类
随着采用的微控制器不同,GDC有很多不同的类型和性能等级。基本上,有5类不同的性能等级。
类是基本型的GDC,它包括一个简单的帧缓冲存储器和一个产生显示信号的控制器。主控制器处理绘图功能,在缓冲器上手动改变显示帧。第二类是复杂一点的版本,包括帧缓冲器和一个具有2D功能图形引擎,例如绘制直线和多边形图形。这类GDC将覆盖2层或3层,完成层间的α混合。
第三类的GDC覆盖更多的层——可能多达4到6层。这一级别的IC用硬件传感器来实现α混合和α平面,并包括全功能的绘图功能。
第四类的GDC在上述功能的基础上增加了下属功能:一个2D/3D图形引擎,一个几何处理器,还有一个内部工作频率为100~200MHz的绘图引擎,它能提供高绘图速率,用于显示点时钟(dot clock)时可以达到400MHz。实际例子就是富士通的32位的MB86296。
后一类也是的GDC,例如富士通的MB86R01,这是另外一种32位的IC,能够提供很多额外的多媒体功能,包括对音视频的支持,能够对音视频进行解码,而并非像其他类型只是捕捉和调整。还包括雾化,加亮和可编程屏蔽功能,从而可以提供生动体验和现场感,而且绘图速率在所有图形显示控制器中是快和高的。
在选择GDC时,确定将送到CPU的处理量也是重要的事情,假如可能的话。假如主处理器处理能力能够达到400MIPs或更高,则将会有很多可用周期,于是则可能用CPU来执行几何操纵,而用一个简单的GDC执行位图操纵。另一方面,假如主处理器不具备足够高的处理速度,就必须利用功能强大的GDC。主处理器必须足够快,以保持为GDC提供位图坐标和显示列表,故必须考虑处理器和GDC的相对等级级别。当然,处理器中的主要考虑取决于所显示的图像或图形的复杂度。
不论IC,都要求它们在执行任务的同时消耗尽可能少的功率。很多新的和效率高的控制器所消耗的功率小于2.3瓦,远小于以前的功耗水平。所以说,图形显示控制器在不断改善其效率和性能。
存储器:GDC中的关键部件
图形存储器是GDC系统中的重要的部件。在GDC作为有效执行绘图功能的几何图形和绘图引擎时,图形存储器提供了缓冲区,所有的图形信息都保存在这里。车辆中的显示器上的显示帧也被存储在图形显示器中。对于及时且可靠地将帧数据提供到视频输出接口来说,这是非常重要的。有一系列不同类型的数据存储在图形存储器里,包括绘图帧,作为绘图帧的子集的显示帧,携带3D绘图所需信息的Z-缓冲数据,来自视频输进接口的视频捕捉缓冲数据(每像素16比特),在绘制多边形时所需的多边形绘图标志缓冲数据(每像素1比特),显示列表数据,纹理图和指针图(Cursor Patterns)数据等。
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