Memory Controller Pointer Calibration for Data Synchronization
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Solution Overview
Problem
The existing memory controllers face issues with non-synchronous data internal and external synchronization, leading to potential system crashes due to noise interference causing incorrect increments in the write pointer, resulting in erroneous data reception and potential system crashes.
Innovation Solution
A pointer calibration unit is introduced to synchronize the write and read pointers by updating the write pointer count based on the read pointer count during the CAS latency period before valid data is written into the FIFO buffer, ensuring accurate counting and preventing system crashes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the write pointer increments based on data strobe signal without calibration, then data writing operation is simple, but noise interference causes incorrect increments leading to system crashes
Solution Approach 1:
The patent applies preliminary action by performing pointer calibration before the actual data writing operation. The calibration process sets up correct pointer positions and relationships in advance, ensuring that when data writing occurs, the pointers are already in the correct state to prevent noise-induced errors. This calibration step occurs during the CAS latency period before valid data is written into the FIFO buffer.
Solution Approach 2:
The patent implements feedback through the pointer calibration unit that continuously monitors and adjusts the write pointer based on the read pointer position. This feedback mechanism ensures that the write pointer accurately reflects the actual data writing state, correcting any deviations caused by noise interference and maintaining system reliability.
2Measurement precision
If pointer calibration is performed continuously, then data synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The calibration operation is performed preliminarily during the CAS latency period before actual data writing begins. This timing strategy allows synchronization accuracy to be established in advance without interfering with the main data processing workflow, thereby achieving high measurement precision while minimizing the impact on overall system performance.
Solution Approach 2:
The pointer calibration unit operates autonomously using the existing read pointer and data strobe signal without requiring external intervention. The system self-calibrates by utilizing its own internal signals and timing mechanisms, which reduces the need for additional complex external calibration hardware while maintaining synchronization accuracy.
3Reliability
If the write pointer is updated during CAS latency period, then data synchronization is improved, but timing control complexity increases
Solution Approach 1:
The write pointer update is performed preliminarily during the CAS latency period, which is a built-in timing window in the memory operation sequence. This preliminary update occurs before data writing begins, allowing the pointer to be correctly positioned in advance. The CAS latency period naturally provides the timing buffer needed for this calibration without requiring additional complex timing control circuits.
Data Source
AI summary
A memory controller and an associated controlling method are provided. The memory controller is connected to a memory module, and includes a FIFO buffer for receiving valid data outputted from the memory module, a write pointer for indicating written data stored in the FIFO buffer, and a read pointer for indicating read data stored in the FIFO buffer. According to the controlling method, during a CAS latency of the memory module after a read command is generated, the value of the write pointer is controlled to have the same value as that of the read pointer.