Qualcomm Incorporated

Behnam Dashtipour

Pankaj Deshmukh

Victor Van Der Veen

David Hartley

Mosaddiq Saifuddin

James Hudson

James Calvin Hudson, Iv

A DRAM memory controller is provided that identifies a marker command directed to a given row in a DRAM. If a threshold probability is satisfied in response to an identification of the marker command, the DRAM memory controller commands the DRAM to refresh a neighboring row in the DRAM. The neighboring row may be a neighboring of the given row or of a recently-closed row.

DRAM with quick random row refresh for rowhammer mitigation

Mitigating or managing an effect known as 'rowhammer' upon a DRAM device may include a memory controller receiving an activation count threshold value from the DRAM device. The memory controller may detect row activation commands directed to the DRAM device and count the number of the row activation commands. The memory controller may send a mitigative refresh command to the DRAM device based on the result of comparing the counted number of row activation commands with the received activation count threshold value.

Dynamic rowhammer management

An effect known as 'rowhammer' may be mitigated in a DRAM organized in sub-banks of two or more rows. Row activation commands directed to a sub-bank may be detected. The number of row activation commands occurring within a refresh window may be counted and compared with a threshold. When it is detected that the number of row activation commands within the refresh window exceeds the threshold, an additional refresh command may be provided to the DRAM.

Dynamic random access memory (DRAM) row hammering mitigation

In some examples of the disclosure, a parameter override mechanism may include a variable length configuration data table with entries for specific models of memory devices. The configuration data table entries may include override parameters for different memory devices and may be dynamically updated with new entries and modifications of existing entries. The parameter override mechanism may be configured to automatically detect a model of memory device and select a corresponding configuration data table entry based on the detected model of memory device or restrict the use of a configuration data table entry based on the detected model of memory device.

Parameter override mechanism for memory systems

Systems and methods for pre-warning a monitoring tool for a communication bus are disclosed. In exemplary aspects, a monitoring tool is coupled to a communication bus. The monitoring tool initially monitors the communication bus in a first manner. When a host changes a parameter of signals on the communication bus, the host sends a signal change command. The monitoring device receives the signal change command and changes the manner that the monitoring device uses to monitor the communication bus or the manner that the monitoring device uses to check protocol. By providing the signal change command before the parameter on the communication bus changes, the monitoring device may use a new manner of monitoring the communication bus in a timely fashion such that the monitoring device does not provide erroneous information about the state of the communication bus.

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San Diego, CA, United States of America

Behnam Dashtipour