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1. 发明授权

US5745739A Virtual coordinate to linear physical memory address converter for computer graphics system 失效
标题翻译：虚拟坐标到计算机图形系统的线性物理内存地址转换器
公开(公告)号：US5745739A
公开(公告)日：1998-04-28
申请号：US598522
申请日：1996-02-08
申请人： Erh-Chiao Wang , Wei-Kuo Chia , Chun-Yang Cheng
发明人： Erh-Chiao Wang , Wei-Kuo Chia , Chun-Yang Cheng
IPC分类号： G06F12/02 , G09G5/393 , G06F12/06
CPC分类号： G09G5/393 , G06F12/0207
摘要： An address generator is disclosed for performing 2-D virtual coordinate to linear physical memory address conversion. The address generator has an edge walking circuit which receives a 2-D virtual coordinate of a first pixel on a first edge of an object displayed on the display screen. The edge walking circuit selectively outputs a 2-D virtual coordinate of a second pixel which intercepts the first edge of the object at an adjacent pixel row or column to the first pixel. The address generator also has a span expansion circuit which receives the 2-D virtual coordinate of the second pixel. The span expansion circuit selectively expands the 2-D virtual coordinate of the second pixel, according to the number of bits used to represent each pixel and the amount of information which can be accessed at a time from memory. This produces first and second expanded coordinates of the second pixel. Furthermore, the address generator has a linear address circuit which receives the first and second expanded coordinates of the second pixel. The linear address circuit outputs a linear physical address of the second pixel in memory.
摘要翻译：公开了一种地址发生器，用于对线性物理存储器地址转换执行2-D虚拟坐标。地址发生器具有边缘行走电路，其接收在显示屏上显示的对象的第一边缘上的第一像素的2-D虚拟坐标。边缘步行电路选择性地输出将相邻像素行或列的对象的第一边缘截取到第一像素的第二像素的2-D虚拟坐标。地址发生器还具有接收第二像素的2-D虚拟坐标的跨度扩展电路。跨度扩展电路根据用于表示每个像素的位数和从存储器一次可访问的信息量来选择性地扩展第二像素的2-D虚拟坐标。这产生第二像素的第一和第二扩展坐标。此外，地址发生器具有接收第二像素的第一和第二扩展坐标的线性地址电路。线性地址电路输出存储器中第二像素的线性物理地址。

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