公开(公告)号：US20200065247A1

公开(公告)日：2020-02-27

申请号：US16113185

申请日：2018-08-27

Applicant: QUALCOMM Incorporated

Inventor： Niket CHOUDHARY ,  David Scott RAY ,  Thomas Philip SPEIER ,  Eric ROBINSON ,  Harold Wade CAIN, III ,  Nikhil Narendradev SHARMA ,  Joseph Gerald MCDONALD ,  Brian Michael STEMPEL ,  Garrett Michael DRAPALA

IPC: G06F12/0862 ,  G06F12/0811

Abstract: An apparatus, method, and system for memory bandwidth aware data prefetching is presented. The method may comprise monitoring a number of request responses received in an interval at a current prefetch request generation rate, comparing the number of request responses received in the interval to at least a first threshold, and adjusting the current prefetch request generation rate to an updated prefetch request generation rate by selecting the updated prefetch request generation rate from a plurality of prefetch request generation rates, based on the comparison. The request responses may be NACK or RETRY responses. The method may further comprise either retaining a current prefetch request generation rate or selecting a maximum prefetch request generation rate as the updated prefetch request generation rate in response to an indication that prefetching is accurate.

公开(公告)号：US20200285597A1

公开(公告)日：2020-09-10

申请号：US16808073

申请日：2020-03-03

Applicant: QUALCOMM Incorporated

Inventor： Joseph Gerald MCDONALD ,  Garrett Michael DRAPALA ,  Eric Francis ROBINSON ,  Thomas Philip SPEIER ,  Kevin Neal MAGILL ,  Richard Gerard HOFMANN

IPC: G06F13/20 ,  G06F9/48

Abstract: Disclosed are ticketed flow control mechanisms in a processing system with one or more masters and one or more slaves. In an aspect, a targeted slave receives a request from a requesting master. If the targeted slave is unavailable to service the request, a ticket for the request is provided to the requesting master. As resources in the targeted slave become available, messages are broadcasted for the requesting master to update the ticket value. When the ticket value has been updated to a final value, the requesting master may re-transmit the request.

公开(公告)号：US20190013062A1

公开(公告)日：2019-01-10

申请号：US15644737

申请日：2017-07-07

Applicant: QUALCOMM Incorporated

Inventor： Francois Ibrahim ATALLAH ,  Gregory Michael WRIGHT ,  Shivam PRIYADARSHI ,  Garrett Michael DRAPALA ,  Harold Wade CAIN, III ,  Erik HEDBERG

IPC: G11C11/406 ,  G06F12/128 ,  G06F12/122 ,  G06F12/0871

Abstract: Systems and methods for selective refresh of a cache, such as a last-level cache implemented as an embedded DRAM (eDRAM). A refresh bit and a reuse bit are associated with each way of at least one set of the cache. A least recently used (LRU) stack tracks positions of the ways, with positions towards a most recently used position of a threshold comprising more recently used positions and positions towards a least recently used position of the threshold comprise less recently used positions. A line in a way is selectively refreshed if the position of the way is one of the more recently used positions and if the refresh bit associated with the way is set, or the position of the way is one of the less recently used positions and if the refresh bit and the reuse bit associated with the way are both set.