Flash Memory Controller Voltage Adjustment for Data Retrieval Accuracy

The patent applies preliminary action by performing a read operation with original threshold voltages first to obtain initial readout information before the memory cells are fully programmed. This preliminary read captures the threshold voltage distribution state before programming disturbances occur, enabling subsequent voltage adjustments to compensate for expected threshold voltage shifts during and after programming.

The patent implements feedback by using the initial readout information obtained at original threshold voltages to dynamically adjust the control gate voltage settings. The system continuously monitors the threshold voltage distribution through read operations and modifies the voltage levels accordingly, creating a closed-loop control mechanism that maintains accurate data retrieval despite threshold voltage drift over time.

The patent applies segmentation by dividing the reading process into distinct stages: first reading at original threshold voltages to obtain initial readout information, then adjusting to modified threshold voltages for subsequent reads. This segmentation allows the system to capture threshold voltage distribution characteristics at different points, enabling accurate data retrieval without requiring complex simultaneous multi-voltage operations.

The patent implements dynamics by making the control gate voltage settings adaptive rather than static. The threshold voltages are dynamically adjusted based on the initial readout information and the specific memory cell states observed. This dynamic adjustment allows the reading operation to adapt to changing threshold voltage distributions while maintaining a relatively simple operational framework.

The patent performs a preliminary read operation at original threshold voltages before the memory cells undergo programming disturbances. This early measurement captures the baseline threshold voltage distribution, allowing the system to predict and compensate for expected voltage shifts. By performing this action in advance, the patent avoids the need for multiple corrective read operations later, actually reducing total access time despite the additional initial read.

The patent applies beforehand cushioning by using the initial readout information to pre-adjust the control gate voltage settings before programming operations that would cause threshold voltage drift. This proactive voltage adjustment creates a buffer against expected threshold voltage changes, ensuring that subsequent read operations can retrieve accurate data without requiring multiple retry reads, thereby compensating for the time invested in the initial read.