See chapter "Hardware design options for Secure Storage" for example, which will render more or less like this:
From a SystemReady perspective, standard interfaces are used, ensuring interoperability between software modules. However, this implementation does not provides security by design, therefore it does not meet BBSR and PSA requirements.
Storage normal world
Storage normal world
figure 1: Storage in normal world diagram
See chapter "Hardware design options for Secure Storage" for example, which will render more or less like this: