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热词
    • 4. 发明授权
    • Application processor and a computing system having the same
    • 应用处理器和具有相同功能的计算系统
    • US08898429B2
    • 2014-11-25
    • US13530623
    • 2012-06-22
    • Kyong-Ho ChoIl-Ho Lee
    • Kyong-Ho ChoIl-Ho Lee
    • G06F12/00
    • G06F12/1009G06F12/1036G06F12/1081G06F12/109G06F2212/656G06F2212/683
    • An application processor includes a system memory unit, peripheral devices, a control unit and a central processing unit (CPU). The system memory unit includes one page table. The peripheral devices share the page table and perform a DMA (Direct Memory Access) operation on the system memory unit using the page table, where each of the peripheral devices includes a memory management unit having a translation lookaside buffer. The control unit divides a total virtual address space corresponding to the page table into sub virtual address spaces, assigns the sub virtual address spaces to the peripheral devices, respectively, allocates and releases a DMA buffer in the system memory unit, and updates the page table, where at least two of the sub virtual address spaces have different sizes from each other. The CPU controls the peripheral devices and the control unit. The application processor reduces memory consumption.
    • 应用处理器包括系统存储器单元,外围设备,控制单元和中央处理单元(CPU)。 系统存储单元包括一个页表。 外围设备共享页表,并使用页表在系统存储器单元上执行DMA(直接存储器访问)操作,其中每个外围设备包括具有翻译后备缓冲器的存储器管理单元。 控制单元将与页表相对应的总虚拟地址空间划分为子虚拟地址空间,分别向外围设备分配子虚拟地址空间,在系统存储单元中分配和释放DMA缓冲器,并更新页表 其中至少两个子虚拟地址空间彼此具有不同的大小。 CPU控制外围设备和控制单元。 应用处理器减少内存消耗。