PRESERVING DETERMINISTIC EARLY VALID ACROSS A CLOCK DOMAIN CROSSING

    公开(公告)号:US20180095910A1

    公开(公告)日:2018-04-05

    申请号:US15283396

    申请日:2016-10-01

    CPC classification number: G06F13/1689 G06F13/1673 G06F13/4068

    Abstract: A clock domain crossing can occur earlier in time by detection of when a data signal will coincide with a TSV (time slot valid) signal but the valid signal associated with the data signal will not coincide with a TSV. In response to such a detection, the domain crossing circuit can send the valid signal early, resulting in a valid signal sent on an earlier TSV and the data signal sent on a TSV. In one embodiment, such a system can cause a data signal to be received in a slower clock domain on a first edge of the slower clock signal after the data is queued in the faster clock domain. The sending of the early valid indication can reduce latency in transferring data between clock domains.

    METHOD OF POLLING ROW HAMMER (RH) INDICATOR INSIDE MEMORY

    公开(公告)号:US20220262428A1

    公开(公告)日:2022-08-18

    申请号:US17738923

    申请日:2022-05-06

    Abstract: Methods and apparatus for row hammer (RH) mitigation and recovery. A host comprising a memory controller is configured to interface with one or more DRAM devices, such as DRAM DIMMs. The memory controller includes host-side RH mitigation logic and the DRAM devices include DRAM-side RH mitigation logic that cooperates with the host-side RH mitigation logic to perform RH mitigation and/or recovery operations in response to detection of RH attacks. The memory controller and DRAM device are configured to support an RH polling mode under which the memory controller periodically polls for RH attack detection indicia on the DRAM device that is toggled when the DRAM device detects an RH attack. The memory controller and DRAM device may also be configured to support an RH ALERT_n mode under which the use of an ALERT_n signal and pin is used to provide an alert to the memory controller to initiate RH mitigation and/or recovery.

Patent Agency Ranking