公开(公告)号：US20070083680A1

公开(公告)日：2007-04-12

申请号：US11246585

申请日：2005-10-07

申请人： Matthew Edward King ,  Peichun Peter Lui ,  David Mui ,  Jieming Qi

发明人： Matthew Edward King ,  Peichun Peter Lui ,  David Mui ,  Jieming Qi

IPC分类号： G06F13/28

CPC分类号： G06F12/1081 ,  G06F13/28

摘要： 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.

摘要翻译： 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。

公开(公告)号：US07644198B2

公开(公告)日：2010-01-05

申请号：US11246585

申请日：2005-10-07

申请人： Matthew Edward King ,  Peichun Peter Lui ,  David Mui ,  Jieming Qi

发明人： Matthew Edward King ,  Peichun Peter Lui ,  David Mui ,  Jieming Qi

IPC分类号： G06F13/28 ,  G06F3/00 ,  G06F13/00

CPC分类号： G06F12/1081 ,  G06F13/28

摘要： 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.

摘要翻译： 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。