Memory Device Receiver Self-Adjustment via Internal Control Circuit
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Solution Overview
Problem
Memory devices face inefficiencies in adjusting input/output characteristics among receivers during the test process, which can be time-consuming and affect performance, especially when multiple devices in a package need to be synchronized without host intervention.
Innovation Solution
A memory device is designed to autonomously adjust its receivers using a test signal and control circuit, allowing for simultaneous optimization of input/output characteristics without relying on a host, thereby improving operating performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If receivers are adjusted during the test process with host intervention, then input/output characteristics can be optimized, but the process becomes time-consuming and reduces productivity
Solution Approach 1:
The memory device autonomously adjusts its own receivers using an internal control circuit that generates test signals and modifies receiver parameters without requiring host device intervention. The control circuit directly controls the receivers and uses internal memory cells as test objects, enabling self-adjustment during the test process.
Solution Approach 2:
The system performs receiver adjustment during the test process before normal operation begins. The control circuit generates test signals and adjusts receiver parameters in advance, ensuring optimal input/output characteristics are established before the memory device enters production mode.
2Productivity
If multiple memory devices in a package are adjusted simultaneously without host intervention, then productivity improves, but coordination and synchronization become more complex
Solution Approach 1:
Each memory device in the package independently performs self-adjustment of its receivers using its own control circuit. Multiple devices operate autonomously during the test process, eliminating the need for complex host-mediated coordination while maintaining synchronization through simultaneous autonomous operation.
3Productivity
If the memory device autonomously adjusts receivers using internal test signals, then host intervention is eliminated and productivity increases, but the device requires additional control circuitry
Solution Approach 1:
The control circuit serves multiple functions: it generates test signals, controls the receivers during adjustment, selects memory cells for testing, and adjusts receiver parameters. This multi-functional approach consolidates what could be separate circuits into a single integrated control unit, minimizing the increase in device complexity.
Solution Approach 2:
The patent combines the test signal generation, receiver control, and receiver adjustment functions into a single control circuit. Additionally, memory cells are used for both data storage and as test objects during receiver adjustment, merging two functional uses into one physical resource.
Data Source
AI summary
A memory device includes a plurality of receivers that each include a first input terminal coupled to one pin of a plurality of input/output pins. The memory devices further includes a transmitter having an output terminal coupled to the first input terminals of the plurality of receivers. The memory device further includes a control circuit configured to control the transmitter to output a particular test signal. The plurality of receivers are each configured to generate output data based on receiving the particular test signal from the transmitter. The control circuit is further configured to adjust the plurality of receivers based on the output data generated by the plurality of receivers and received at the control circuit from the plurality of receivers.