Before revision: If all the registers that hold state in an IC are on one or more internal scan chains, then the function of the registers and the combinational logic between them will generate a unique CRC signature over a large enough sample of random inputs.
After revision: If all the registers that hold state in an IC are on one or more internal scan chains, then the function of the registers and the combinational logic between them will g enerate a unique CRC signature over a large enough sample of random inputs.