公开(公告)号：US20150286269A1

公开(公告)日：2015-10-08

申请号：US14243706

申请日：2014-04-02

Applicant: QUALCOMM INCORPORATED

Inventor： Sreekumar Padmanabhan ,  Satyaki Mukherjee

IPC: G06F1/32 ,  G06F12/10 ,  G06F12/12

CPC classification number: G06F1/3275 ,  G06F12/0862 ,  G06F12/1027 ,  G06F12/123 ,  G06F2212/654 ,  Y02D10/14

Abstract: A method and system for reducing power consumption while improving efficiency of a memory management unit of a portable computing device are described. The method and system include determining if data of a memory request exists within a first memory element external to the memory management unit. The first memory element may include a cache. If the data of the memory request does not exist within the first memory element, then a magnitude of a burst length value of the memory request may be determined. Subsequently, a page table walk may be conducted with a second memory element, such as DDR memory, that corresponds with the magnitude of the burst length value of the memory request. Each memory request may include a descriptor. The descriptor may have a reserved field region that includes a pre-fetch hint which indicates whether next descriptors in the second memory element are valid or not.

Abstract translation: 描述了一种用于在提高便携式计算设备的存储器管理单元的效率的同时降低功耗的方法和系统。 所述方法和系统包括确定存储器请求的数据是否存在于存储器管理单元外部的第一存储器元件内。 第一存储器元件可以包括高速缓存。 如果存储器请求的数据不存在于第一存储器元件内，则可以确定存储器请求的突发长度值的大小。 随后，可以利用对应于存储器请求的突发长度值的大小的第二存储器元件（例如DDR存储器）来进行页表移动。 每个存储器请求可以包括描述符。 描述符可以具有保留字段区域，其包括预取提示，其指示第二存储器元素中的下一个描述符是否有效。

公开(公告)号：US20150286270A1

公开(公告)日：2015-10-08

申请号：US14291100

申请日：2014-05-30

Applicant: QUALCOMM INCORPORATED

Inventor： Sreekumar Padmanabhan ,  Satyaki Mukherjee

IPC: G06F1/32 ,  G06F12/08 ,  G06F12/10

CPC classification number: G06F1/3275 ,  G06F12/0862 ,  G06F12/0875 ,  G06F12/1009 ,  G06F2212/6026 ,  G06F2212/654 ,  Y02D10/13 ,  Y02D10/14

Abstract: A method and system for reducing power consumption while improving efficiency of a memory management unit of a portable computing device include determining if data of a memory request exists within a first memory element external to the memory management unit. The first memory element may include a cache. If the data of the memory request does not exist within the first memory element, then a magnitude of a burst length value of the memory request may be determined. Subsequently, a page table walk may be conducted with a second memory element, such as DDR (double-data rate) memory, that corresponds with the magnitude of the burst length value of second memory element (DDR). Each memory request may include a descriptor. The descriptor may have a reserved field region that includes a pre-fetch hint which indicates whether next descriptors in the second memory element are valid or not.

Abstract translation: 一种用于降低功耗同时提高便携式计算设备的存储器管理单元的效率的方法和系统包括确定存储器请求的数据是否存在于存储器管理单元外部的第一存储器元件内。 第一存储器元件可以包括高速缓存。 如果存储器请求的数据不存在于第一存储器元件内，则可以确定存储器请求的突发长度值的大小。 随后，可以使用与第二存储器元件（DDR）的突发长度值的大小对应的第二存储器元件（例如DDR（双数据速率）存储器）进行页表移动。 每个存储器请求可以包括描述符。 描述符可以具有保留字段区域，其包括预取提示，其指示第二存储器元素中的下一个描述符是否有效。