The NRD signal is characterized by a setup timing, a pulse width and a hold timing.
- nrd_setup— NRD setup time is defined as the setup of address before the NRD falling edge;
- nrd_pulse—NRD pulse length is the time between NRD falling edge and NRD rising edge;
- nrd_hold—NRD hold time is defined as the hold time of address after the NRD rising edge.