A system and method for delivering fluid into a flexible biological barrier employs a microneedle structure wherein a final position of microneedles inserted into the biological barrier is generally sideways projecting from the delivery configuration instead of the conventional downwards projecting arrangement. The second electrode has an area of overlap with the magneto-resistive memory element that is greater than an area of overlap of the first electrode and the magneto-resistive memory element. Based on the metrics, the method and apparatus may effectively discriminate a case where a data frame is received as an erasure, and a case where a transmitted data frame is received as a DTX frame.