Abstract: In a digital memory system, systems and methods that control a logical value and an integrity of data represented by charge are provided. In one embodiment, a bit line is coupled to the cell. A voltage generator is arranged to generate a plurality of cell operating voltages varying in response to a voltage control signal. A controller generates a control signal, stores a predetermined one of logical values in a cell by generating a series of operating voltages, transmits the series of operating voltages, and determines whether the predetermined one of the logical values has been stored in the cell in response to a voltage on the bit line. The controller includes a charge integrity estimating module and determines whether the predetermined one of the logical values has been stored in the cell by initiating the operation of the charge integrity estimating module.

Abstract: A digital memory system (30) includes a memory cell (10), a bit line (12), a voltage generator (320) a controller (90) and a charge integrity estimating module (135). A series of successively larger operating voltages are transmitted to the cell from the voltage generator. The controller determines whether a predetermined value has been stored in the cell. The charge integrity estimating module detects the quantity of charge in the memory cell, for example, by using a sense amplifier (170).

Abstract: A digital memory system (30) includes a memory cell (10), a bit line (12), a voltage generator (320) and a controller (90). The controller is arranged to store a predetermined logical value in the cell by generating a series of the operating voltages beginning with the first voltage and continuing with successively larger operating voltages greater the first voltage. The voltages are transmitted to the cell from the voltage generator. After each transmittal of one of the series of operating voltages, the controller causes at least a portion of the charge stored in the cell to flow in the bit line. The controller determines whether the predetermined one of the logical values has been stored in the cell in response to the flow of charge. The controller terminates transmittal of the series of operating voltages to the cell in the event that the predetermined one of the logical states has been stored or in the event that one of the series of successively larger operating voltages equals the second voltage.