Invention Grant
- Patent Title: Memory calibration system and method
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Application No.: US16938855Application Date: 2020-07-24
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Publication No.: US11664062B2Publication Date: 2023-05-30
- Inventor: Jing Wang , Kedarnath Balakrishnan , Kevin M. Brandl , James R. Magro
- Applicant: Advanced Micro Devices, Inc.
- Applicant Address: US CA Santa Clara
- Assignee: ADVANCED MICRO DEVICES, INC.
- Current Assignee: ADVANCED MICRO DEVICES, INC.
- Current Assignee Address: US CA Santa Clara
- Agency: Volpe Koenig
- Main IPC: G06F9/00
- IPC: G06F9/00 ; G11C11/406 ; G06F9/4401 ; G06F1/3203

Abstract:
A method for performing stutter of dynamic random access memory (DRAM) where a system on a chip (SOC) initiates bursts of requests to the DRAM to fill buffers to allow the DRAM to self-refresh is disclosed. The method includes issuing, by a system management unit (SMU), a ForceZQCal command to the memory controller to initiate the stutter procedure in response to receiving a timeout request, such as an SMU ZQCal timeout request, periodically issuing a power platform threshold (PPT) request, by the SMU, to the memory controller, and sending a ForceZQCal command prior to a PPT request to ensure re-training occurs after ZQ Calibration. The ForceZQCal command issued prior to PPT request may reduce the latency of the stutter. The method may further include issuing a ForceZQCal command prior to each periodic re-training.
Public/Granted literature
- US20220028450A1 MEMORY CALIBRATION SYSTEM AND METHOD Public/Granted day:2022-01-27
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