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. 2016 Jan 6;9:484. doi: 10.3389/fnins.2015.00484

Figure 3.

Figure 3

A parallel write is illustrated. Weight Wij is updated by xi × yj. In order to achieve a multiplicative effect the xi are encoded in time while the yi are encoded in the height of a voltage pulse. The resistive memory will only train when xi is non-zero. The height of yi determines the strength of training when xi is non-zero.