公开(公告)号：US20170371797A1

公开(公告)日：2017-12-28

申请号：US15192984

申请日：2016-06-24

Applicant: QUALCOMM Incorporated

Inventor： Andres Alejandro OPORTUS VALENZUELA ,  Nieyan GENG ,  Gurvinder Singh CHHABRA ,  Richard SENIOR ,  Anand JANAKIRAMAN

IPC: G06F12/0877 ,  G06F12/0842

CPC classification number: G06F12/0877 ,  G06F12/023 ,  G06F12/0842 ,  G06F12/0855 ,  G06F12/0886 ,  G06F2212/1024 ,  G06F2212/401 ,  G06F2212/604 ,  H03M7/30

Abstract: Some aspects of the disclosure relate to a pre-fetch mechanism for a cache line compression system that increases RAM capacity and optimizes overflow area reads. For example, a pre-fetch mechanism may allow the memory controller to pipeline the reads from an area with fixed size slots (main compressed area) and the reads from an overflow area. The overflow area is arranged so that a cache line most likely containing the overflow data for a particular line may be calculated by a decompression engine. In this manner, the cache line decompression engine may fetch, in advance, the overflow area before finding the actual location of the overflow data.

公开(公告)号：US20170371792A1

公开(公告)日：2017-12-28

申请号：US15193001

申请日：2016-06-24

Applicant: QUALCOMM Incorporated

Inventor： Andres Alejandro OPORTUS VALENZUELA ,  Nieyan GENG ,  Christopher Edward KOOB ,  Gurvinder Singh CHHABRA ,  Richard SENIOR ,  Anand JANAKIRAMAN

IPC: G06F12/0871 ,  G06F12/0868

CPC classification number: G06F12/0871 ,  G06F12/02 ,  G06F12/0802 ,  G06F12/0868 ,  G06F2212/1024 ,  G06F2212/1044 ,  G06F2212/281 ,  G06F2212/282 ,  G06F2212/313 ,  G06F2212/401 ,  G06F2212/601 ,  G06F2212/608

Abstract: In an aspect, high priority lines are stored starting at an address aligned to a cache line size for instance 64 bytes, and low priority lines are stored in memory space left by the compression of high priority lines. The space left by the high priority lines and hence the low priority lines themselves are managed through pointers also stored in memory. In this manner, low priority lines contents can be moved to different memory locations as needed. The efficiency of higher priority compressed memory accesses is improved by removing the need for indirection otherwise required to find and access compressed memory lines, this is especially advantageous for immutable compressed contents. The use of pointers for low priority is advantageous due to the full flexibility of placement, especially for mutable compressed contents that may need movement within memory for instance as it changes in size over time