Flash controller on this device contain mini-cache memory (instead of simple preftech buffer) where every cache line (i.e. set) consists of 32 bytes.

If read data are already pre-fetched (for instance they are accessed second time) then access time is 1 platform clock, it is cache hit.
If read data are not pre-fetched (for instance accessed first time) then access time 5 platfrom clocks, it is cache miss.