公开(公告)号：US09965222B1

公开(公告)日：2018-05-08

申请号：US15299994

申请日：2016-10-21

Applicant: Advanced Micro Devices, Inc.

Inventor： Kevin M. Brandl ,  Scott P. Murphy ,  James R. Magro ,  Paramjit K. Lubana

IPC: G06F3/06 ,  G06F11/07

CPC classification number: G06F11/073 ,  G06F11/0793 ,  G06F13/16

Abstract: A data processing system includes a memory channel and a data processor coupled to the memory channel. The data processor includes a memory controller coupled to the memory channel and is adapted to access at least one rank of double data rate memory. The memory controller includes a command queue for storing received memory access requests, and an arbiter for picking memory access requests from the command queue, and then providing the memory access requests to the memory channel. The memory access requests are selected based on predetermined criteria, and in response to a mode register access request to quiesce pending operations. Additionally, the memory controller includes a mode register access controller that in response to the mode register access request, generates at least one corresponding mode register set command to a memory bus. The memory controller then relinquishes control of the memory bus to the arbiter thereafter.

公开(公告)号：US20180113648A1

公开(公告)日：2018-04-26

申请号：US15299994

申请日：2016-10-21

Applicant: Advanced Micro Devices, Inc.

Inventor： Kevin M. Brandl ,  Scott P. Murphy ,  James R. Magro ,  Paramjit K. Lubana

IPC: G06F3/06 ,  G06F11/07

CPC classification number: G06F11/073 ,  G06F11/0793 ,  G06F13/16

Abstract: A data processing system includes a memory channel and a data processor coupled to the memory channel. The data processor includes a memory controller coupled to the memory channel and is adapted to access at least one rank of double data rate memory. The memory controller includes a command queue for storing received memory access requests, and an arbiter for picking memory access requests from the command queue, and then providing the memory access requests to the memory channel. The memory access requests are selected based on predetermined criteria, and in response to a mode register access request to quiesce pending operations. Additionally, the memory controller includes a mode register access controller that in response to the mode register access request, generates at least one corresponding mode register set command to a memory bus. The memory controller then relinquishes control of the memory bus to the arbiter thereafter.