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    • 4. 发明申请
    • System and method for improved DMAC translation mechanism
    • 改进DMAC翻译机制的系统和方法
    • US20070083680A1
    • 2007-04-12
    • US11246585
    • 2005-10-07
    • Matthew Edward KingPeichun Peter LuiDavid MuiJieming Qi
    • Matthew Edward KingPeichun Peter LuiDavid MuiJieming Qi
    • G06F13/28
    • G06F12/1081G06F13/28
    • A system and method for improved DMAC translation mechanism is presented. DMA commands are “unrolled” based upon the transfer size of the DMA command and the amount of data that a computer system transfers at one time. For the first DMA request, a DMA queue requests a memory management unit to perform an address translation. The DMA queue receives a real page number from the MMU and, on subsequent rollout requests, the DMA queue provides the real page number to a bus interface unit without accessing the MMU until the transfer crosses into the next page. Rollout logic decrements the DMA command's transfer size after each DMA request, determines whether a new page has been reached, determines if the DMA command is completed, and sends write back information to the DMA queue for subsequent DMA requests.
    • 提出了一种用于改进DMAC转换机制的系统和方法。 DMA命令根据DMA命令的传输大小和计算机系统一次传输的数据量“展开”。 对于第一个DMA请求,DMA队列请求内存管理单元执行地址转换。 DMA队列从MMU接收实际页码,并且在随后的发布请求中,DMA队列向总线接口单元提供实际页号,而不访问MMU,直到传输跨进下一页。 在每个DMA请求之后,滚动逻辑会递减DMA命令的传输大小,确定是否已经达到新的页面,确定DMA命令是否完成,并将后续的DMA请求的回写信息发送到DMA队列。
    • 6. 发明授权
    • DMAC translation mechanism
    • DMAC翻译机制
    • US07644198B2
    • 2010-01-05
    • US11246585
    • 2005-10-07
    • Matthew Edward KingPeichun Peter LuiDavid MuiJieming Qi
    • Matthew Edward KingPeichun Peter LuiDavid MuiJieming Qi
    • G06F13/28G06F3/00G06F13/00
    • G06F12/1081G06F13/28
    • An improved DMAC translation mechanism is presented. DMA commands are “unrolled” based upon the transfer size of the DMA command and the amount of data that a computer system transfers at one time. For the first DMA request, a DMA queue requests a memory management unit to perform an address translation. The DMA queue receives a real page number from the MMU and, on subsequent rollout requests, the DMA queue provides the real page number to a bus interface unit without accessing the MMU until the transfer crosses into the next page. Rollout logic decrements the DMA command's transfer size after each DMA request, determines whether a new page has been reached, determines if the DMA command is completed, and sends write back information to the DMA queue for subsequent DMA requests.
    • 提出了改进的DMAC翻译机制。 DMA命令根据DMA命令的传输大小和计算机系统一次传输的数据量“展开”。 对于第一个DMA请求,DMA队列请求内存管理单元执行地址转换。 DMA队列从MMU接收实际页码,并且在随后的发布请求中,DMA队列向总线接口单元提供实际页号,而不访问MMU,直到传输跨进下一页。 在每个DMA请求之后,滚动逻辑会递减DMA命令的传输大小,确定是否已经达到新的页面,确定DMA命令是否完成,并将后续的DMA请求的回写信息发送到DMA队列。
    • 10. 发明授权
    • Multiplexer methods and apparatus
    • 多路复用器方法和装置
    • US06822486B1
    • 2004-11-23
    • US10635968
    • 2003-08-07
    • Matthew E. KingPeichun LiuDavid MuiJieming Qi
    • Matthew E. KingPeichun LiuDavid MuiJieming Qi
    • H03K1700
    • H04J3/047
    • In a first aspect, a method is provided for selecting a signal from a plurality of signals. The method includes the steps of (1) providing a plurality of multiplexers, each multiplexer configured to selectively output one of a plurality of signals input by the multiplexer using an output of the multiplexer; (2) selecting an input signal from one of the plurality of multiplexers to output; (3) outputting the selected input signal from the output of the one of the plurality of multiplexers; (4) forcing the outputs of the other of the plurality of multiplexers to a predetermined logic state; and (5) combining the outputs of the plurality of multiplexers so as to output the selected input signal. Numerous other aspects are provided.
    • 在第一方面,提供一种用于从多个信号中选择信号的方法。 该方法包括以下步骤:(1)提供多个复用器,每个多路复用器被配置为使用多路复用器的输出来选择性地输出由多路复用器输入的多个信号中的一个信号; (2)选择来自多个多路复用器中的一个的输入信号进行输出; (3)从所述多个复用器中的一个的输出端输出所选择的输入信号; (4)将所述多个复用器中的另一个的输出强制为预定的逻辑状态; 以及(5)组合多个复用器的输出以输出所选择的输入信号。 提供了许多其他方面。