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    • 4. 发明授权
    • Buffer memory configuration having a memory between a USB and a CPU
    • 具有在USB和CPU之间的存储器的缓冲存储器配置
    • US06421770B1
    • 2002-07-16
    • US09120160
    • 1998-07-21
    • Martin HuchJens BarrenscheenGunther Fenzl
    • Martin HuchJens BarrenscheenGunther Fenzl
    • G06F1202
    • G06F5/16G06F5/10
    • The buffer memory configuration has a memory disposed between a USB and a central processing unit. The memory can be mapped onto an address space which is exactly half as large as the memory itself. The first half of the memory defines a first memory page and the second half of the memory defines a second memory page, and each address in the address space is assigned exactly one memory location on each of the memory pages. A memory management unit generates a first significant bit which assigns in each case the two memory locations having the same address to the address space of the first memory page and to the address space of the second memory page. The buffer memory architecture enables the memory independently to manage the data to be transferred. The two memory pages serve to decouple the central processing unit CPU and the bus. Both memory pages are virtually visible to the user but only one of the memory pages can ever be addressed for data transfer. Consequently, overlapping of the writing cycles is avoided by arranging the transmitted data and the data to be read out in separate areas of the memory.
    • 缓冲存储器配置具有设置在USB和中央处理单元之间的存储器。 存储器可以被映射到正好与存储器本身一半一样大的地址空间。 存储器的前半部分定义第一存储器页面,并且存储器的第二半部分定义第二存储器页面,并且每个存储器页面上分配地址空间中的每个地址恰好一个存储器位置。 存储器管理单元产生第一有效位,其在每种情况下将具有相同地址的两个存储器位置分配给第一存储器页的地址空间和第二存储器页的地址空间。 缓冲存储器架构使内存独立地管理要传输的数据。 两个存储器页面用于去耦中央处理单元CPU和总线。 两个内存页面对用户实际上是可见的,但只有一个内存页面可以被寻址用于数据传输。 因此,通过将发送的数据和要在存储器的不同区域中读出的数据进行布置来避免写入周期​​的重叠。