Memory Controller Read Latency Calibration for Signal Timing
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Solution Overview
Problem
Modern electronic systems face increased errors in communication due to higher clock speeds, leading to inaccuracies in data transfer between devices, particularly in setting the correct latency window for data and strobe signals in memory devices.
Innovation Solution
A method for calibrating the read latency and latency window of memory devices by iteratively adjusting the clock cycles until accurate data retrieval is achieved, ensuring that data and strobe signals are received within the desired latency window, thereby improving data transfer accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clock speed is increased to improve performance, then productivity is improved, but reliability deteriorates due to increased errors in communication
Solution Approach 1:
The patent performs timing calibration before normal data transfer operations. The controller and memory device execute calibration sequences that establish correct latency values and latency windows in advance, ensuring that subsequent high-speed operations occur with pre-optimized timing parameters that account for signal propagation delays and processing variations.
Solution Approach 2:
The patent implements a feedback mechanism where the controller sends test data to the memory device, reads back the retrieved data, and compares it with expected data. Based on this feedback loop, the controller adjusts latency values and latency windows iteratively until the correct timing parameters are found, thereby compensating for high-speed communication errors through adaptive optimization.
2Device complexity
If latency window is fixed to simplify timing, then device complexity is reduced, but measurement precision deteriorates in determining correct data retrieval timing
Solution Approach 1:
The patent makes the latency window dynamic by allowing it to be adjusted based on calibration results. Instead of using a single fixed latency window, the system determines optimal latency values through calibration and applies these calibrated values to set appropriate latency windows for different operating conditions, enabling precise timing control while maintaining manageable complexity through automated calibration.
Data Source
AI summary
Methods and systems for calibrating parameters for communication between a controller and a memory device. A memory controller may be configured to calibrate one or more of the read latency and/or the latency window of a memory controller such that a data signal and a data strobe signal are received by the memory controller within the latency window of the memory controller.