Programming circuit, integrated circuit, and method

An integrated circuit, comprising:

• a plurality of first conductive lines;
• a plurality of second conductive lines;
• an array of memory cells each coupled to
• a corresponding first conductive line among the plurality of first conductive lines, and
• a corresponding second conductive line among the plurality of second conductive lines;
• and
• a plurality of programming circuits correspondingly coupled to the plurality of first conductive lines, each programming circuit of the plurality of programming circuits configured to
• detect a time difference between a first pulse and a second pulse,
• generate a program voltage corresponding to the detected time difference, and
• output the generated program voltage to the corresponding first conductive line to program a corresponding memory cell in the array of memory cells with the program voltage,
• wherein the programming circuit is configured to generate the program voltage by:
• in response to a sign of the detected time difference being one of a positive sign and a negative sign, generating the program voltage based on a first set of waveform configurations having a same duration and different amplitudes, and
• in response to the sign of the detected time difference being the other of the positive sign and the negative sign, generating the program voltage based on a second set of waveform configurations having a same amplitude and different durations.

A method, comprising:

• detecting a time difference between a first pulse from a first neuron device and a second pulse from a second neuron device;
• generating a program voltage corresponding to the detected time difference;
• and
• applying the generated program voltage to a synapse device coupled between the first neuron device and the second neuron device to program the synapse device in accordance with spike-timing dependent plasticity (STDP),
• the method further comprising:
• storing a plurality of different waveform configurations correspondingly associated with different values of the time difference;
• and
• selecting, among the plurality of different waveform configurations, a waveform configuration corresponding to a value of the detected time difference,
• wherein
• said generating comprises generating the program voltage based on the selected waveform configuration, and
• the plurality of different waveform configurations has corresponding different inclinations.