60.6.3.3.9.1 Principle
The internal random number generator (IRNG) is used to generate dynamic signatures through the I/O pins split in pairs. For each pair, a signature is transmitted on the even-indexed I/O, and must be externally fed back on the odd-indexed I/O. The following order must be followed for an external connection:
- PIOBU0 → PIOBU1
- PIOBU2 → PIOBU3
A dynamic signature is made of random patterns (one pattern = one high state followed by one low state). The duration of stable states is a multiple of an internal signature clock.
The signatures are unique and incompatible. This connection order is mandatory.
The figure below provides an overview of the dynamic detection system.