Multichip-System und Verfahren zur Versorgung von Taktsignalen dafür

摘要

A light emitting unit (30) blinks based on a clock signal coming from a clock signal supply unit (4), whereby the clock signal (electric signal) is transformed into a light signal. The light signal is directed towards a plurality of semiconductor chips (10A) each of which has an internal circuit and a photodetector. The photodetectors receive the light signal, transform the light signal back into an electric signal, and supply the electric signal as a clock signal to the internal circuits. Thus, clock skew caused by the impedance of aluminium wires is eliminated, so that the periods of signal transmission time for supplying the clock signal to the respective semiconductor chips (10A) are substantially equal.