A process and apparatus to support passive call blocking, a call block that is performed in a manner that the caller does not recognize as a call block. The analog current supply circuit has a calibration function of compensating for output current variations due to transistor characteristics at one point in a control range of the first output current. A frequency-dependent warping is applied to the decorrelation filter. When the difference between the oldest read pointer and the write pointer exceeds a configurable transmission on threshold, the lossless system controller ceases issuing flow control commands, and the input ports can resume receiving data packets. The process for reducing the resistance of the oxide semiconductor film may be a laser process or heat treatment at a temperature higher than or equal to 450\xb0 C. This protocol prevents the facile creation of counterfeit copies.