Memory Device Data Output Circuit Latency Status Transmission
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Solution Overview
Problem
Conventional memory devices face challenges in efficiently transmitting status data to memory controllers to determine the need for retraining operations, leading to potential failures due to skew between data and clock signals caused by changes in the operating environment.
Innovation Solution
A memory device with a data output circuit that transmits status data, including retraining data, during a latency period using a data strobe signal, along with user data subsequent to the latency period, to enable timely retraining operations and improve memory performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory device waits for the training operation to complete before transmitting status data, then the data alignment can be ensured, but the time delay increases and retraining operations may be delayed
Solution Approach 1:
The memory device transmits status data during the latency period (training operation) before the normal data transmission begins. This preliminary transmission of status information allows the memory controller to determine whether retraining is needed without waiting for the entire training operation to complete, thus reducing time delay while maintaining data alignment reliability.
2Loss of time
If the memory device transmits status data during the latency period, then the transmission time is reduced, but the data may not be fully aligned yet
Solution Approach 1:
The patent segments the data transmission process into two parts: (1) transmitting status data during the latency period for quick retraining determination, and (2) transmitting actual user data after the latency period when alignment is ensured. This segmentation allows the memory device to reduce transmission time for status information while maintaining data alignment reliability for actual data transmission.
3Reliability
If the memory controller performs retraining operation frequently, then the data alignment is maintained, but the system complexity and overhead increase
Solution Approach 1:
The memory device transmits status data including information about the memory device's operational state to the memory controller during the latency period. This feedback mechanism allows the memory controller to make informed decisions about whether retraining is actually needed, avoiding unnecessary retraining operations and reducing system complexity while maintaining data alignment reliability when needed.
Data Source
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AI summary
A memory device includes a memory cell array configured to store data; and a data output circuit configured to transmit status data to an external device through at least one data line in a latency period in response to a read enable signal received from the external device and transmit the data read from the memory cell array to the external device through the at least one data line in a period subsequent to the latency period.