A system includes at least one Input/Output (I/O) interface and a processor. The processor is coupled to the at least one I/O interface. The processor is configured to perform, according to a file or a rule inputted from the at least one I/O interface, operations below. When the at least one condition is present in a signal to be received or transmitted by a terminal of a cell, a plurality of conductive segments is assigned to the terminal of the cell, to transmit the signal to the terminal of the cell. When the at least one condition one is not present in the signal, a single route is assigned to the terminal of the cell, to transmit the signal to the terminal of the cell. The single route and each of the conductive segments are configured to have the same width.