Abstract: The LSI system is provided with a transmission-side LSI chip which outputs a plurality of data sequences as parallel data from a plurality of output terminals; a multiplexer which converts the parallel data output from the transmission-side LSI chip into serial data; a transmission module which converts the serial data into a light signal and transmits the light signal to an optical transmission line; a reception-side module which receives the light signal supplied via the optical fiber, converts the light signal into serial data, and outputs the serial data; a demultiplexer which converts the serial data output from the reception module to parallel data corresponding to a plurality of input terminals; and a reception-side LSI chip which receives the parallel data output from the demultiplexer via a plurality of input terminals.

Abstract: A semiconductor integrated circuit comprising a plurality of blocks the included circuit components, where the blocks are separated from each other in a semiconductor substrate. Wiring is conducted by using horizontal and verticle wirings along the horizontal and vertical lines of an imaginary wiring grid established in a wiring region between the blocks and diagonal wirings are provided in the process of producing the blocks, wherein the diagonal directions are relative to the horizontal and vertical directions of the imaginary wiring grid.