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    • 6. 发明申请
    • VIRTUAL MEMORY SYSTEM
    • 虚拟内存系统
    • WO1992002879A1
    • 1992-02-20
    • PCT/GB1990001213
    • 1990-08-03
    • DU PONT PIXEL SYSTEMS LIMITEDMAUND, Andrew, PeterNEAVE, John, WalterTREVETT, Neil, FrancisMOORE, Simon, JamesWILSON, Malcolm, Eric
    • DU PONT PIXEL SYSTEMS LIMITED
    • G06F12/10
    • G09G5/393G06F12/1027G06F2212/655
    • In a demand-paged virtual memory system, the pages are arranged in the virtual memory space in groups. In order to translate an address from the virtual address space to a physical memory address space, the virtual group address component is input to a contents addressable memory (CAM)(745) which outputs a group code (767), and the group code and virtual page address component (768X,Y) are input to a RAM page table (750) which outputs the page address. When the physical memory capacity is substantially smaller than the virtual address space, the CAM provides a large saving in page table size. In the case where the data-elements provide a plural-dimensional representation, for example as in pixel data, the pages include data elements which are contiguous in each of the plural dimensions in order to reduce the amount of page-swapping between the physical memory and a paging memory. The data-elements in the physical memory are accessible in parallel as contiguous patches. In order to allow parallel access of patches which are not aligned with respect to a page and therefore may fall partly on the edge of one page and partly on the edge of a page which is contiguous therewith in the virtual memory but not in the physical memory, the addressing means includes means (758) to determine whether a patch to be accessed has data-elements in different pages, and means (756, 778, 782X,Y) to modify the addresses to the physical memory.
    • 在需求分页的虚拟存储器系统中,页面被分组地布置在虚拟存储器空间中。 为了将地址从虚拟地址空间转换为物理存储器地址空间,虚拟组地址组件被输入到输出组代码(767)的内容可寻址存储器(CAM)(745),并且组代码和 虚拟页面地址组件(768X,Y)被输入到输出页面地址的RAM页面表(750)。 当物理存储容量显着小于虚拟地址空间时,CAM可以大大节省页表大小。 在数据元素提供例如像素数据中的多维表示的情况下,页面包括在多个维度中的每一个中连续的数据元素,以便减少物理存储器之间的页面交换量 和分页存储器。 物理内存中的数据元素可以并行访问作为连续的补丁。 为了允许并行访问相对于页面不对齐的片段,因此可以部分地落在一个页面的边缘并且部分地落在与虚拟存储器中相邻但不在物理存储器中的页面的边缘上 寻址装置包括用于确定要访问的补丁是否具有不同页面中的数据元素的装置(758),以及用于将地址修改为物理存储器的装置(756,778,782X,Y)。