Test Solution for a Random Number Generator

A random number generator comprising:

• one or more ring oscillator structures, each of the one or more ring oscillator structure having an output connected through a network of logic gates and storage cells for random number generation, each of the one or more ring oscillator structures comprising:
• a ring oscillator for generating random numbers, and
• a test structure to reconfigure a ring oscillator structure into a testable structure for testing the ring oscillator structure and the network of logic gates and storage cells
• an XOR network having a plurality of inputs coupled to outputs of the one or more ring oscillator structures and having an output to provide a test response;
• a plurality of registers, each of the registers coupled to provide a test input to the XOR network and to receive an output of one of the one or more ring oscillator structures;
• and
• a plurality of multiplexers having a pair of inputs and an output, the output of each of the multiplexers coupled to an input of a ring oscillator structure, the inputs coupled to a test input and an output of one of the plurality of registers.