1. A computer implemented method of system refresh in a cache memory, the method comprising: generating a refresh time period (RTIM) pulse at a centralized refresh controller of the cache memory; activating a refresh request at the centralized refresh controller based on generating the RTIM pulse, the refresh request associated with a single cache memory bank of the cache memory; receiving a refresh grant based on activating the refresh request; and transmitting the refresh grant to a bank controller, the bank controller associated, and localized, at the single cache memory bank of the cache memory.