The RNG is controlled by an finite state machine (FSM) which handles all the low-level interactions between
the different hardware components described in
Random number generator block diagram .
During normal operation the FSM ensures that the entropy source is controlled in a NIST-800-90B
compatible way, as shown in the following figure.
Figure 4. Control FSM state diagram
The state diagram does not show that asserting the hard or soft resets and/or
de-asserting the enable bit cause the state to be reset to "Reset".