Program current controller and sense circuit for cross-point memory devices

An apparatus comprising:

• a memory array;
• a wordline decoder configured to apply a voltage to a wordline for accessing first memory cells in the memory array, wherein the wordline decoder is further configured to operate in a first program polarity or a second program polarity, and wherein the first and second program polarities are opposite;
• a plurality of digit line decoders, each digit line decoder configured to apply a voltage to a respective digit line for accessing a respective one of the first memory cells;
• and
• a plurality of switches configured to couple each digit line decoder to a respective first sensing circuit when operating in the first program polarity, or to a respective second sensing circuit when operating in the second program polarity.

A method comprising:

• applying, by digit line decoders, a voltage to respective digit lines for accessing a respective one of first memory cells;
• selecting, by a controller, a program polarity to be a first program polarity or a second program polarity, wherein the first and second program polarities are opposite;
• and
• coupling, based on the selected program polarity, each digit line decoder to a respective first sensing circuit when the first program polarity is selected, or to a respective second sensing circuit when the second program polarity is selected.

A non-transitory computer-readable medium storing instructions which, when executed by a controller, cause the controller to:

• select a first access line for accessing a memory cell;
• select, using a decoder, a second access line for accessing the memory cell;
• select operation in a first program polarity or a second program polarity, wherein the first and second program polarities are opposite;
• and
• for operation in either of the selected first or second program polarity, sense a current through the decoder, and limit the current.