Patent ID: 8073889
Filing Date: 2011-12-06
Classification: G06F,H04L

Abstract:
1. A random number generating circuit, comprising: a seed generating circuit configured to generate a seed; and a pseudo random number circuit configured to generate pseudo random numbers based on the seed generated by the seed generating circuit, the seed generating circuit including: the oscillating circuit has a first exclusive OR computing circuit, a first inverter circuit, a second exclusive OR computing circuit, and a second inverter circuit, coupled in series in this order, data are given to one of input ends of the first exclusive OR computing circuit and to one of input ends of the second exclusive OR computing circuit, respectively, the oscillating circuit oscillates when the data inputted to the first and second exclusive OR computing circuits have a specific combination, and appearance frequencies of “0” and “1” outputted from the smoothing circuit are more close to 1:1 than appearance frequencies of “0” and “1” in the digital data sequence outputted from the oscillating circuit.