4. Per 128-bit for Program Flash (bank 0), accessing the fifth longword requires 1 core
clock cycle. The flash memory read itself takes 4 clocks, but the access starts
immediately after the first read. As a result, 3 clocks for this access overlap with the
second, third, and fourth longword reads from the core.
5. Per 64-bit for Data Flash (bank 1), reading the fourth longword, like the second
longword, takes only 1 clock due to the 64-bit flash memory data bus.
6. Per 128-bit for Program Flash (bank 0), reading the sixth, seventh, and eighth
longwords takes only 1 clock each because the data is already available inside the
FAU.
16.2 Usage Guide
For many systems the on-chip flash is the main memory. The Flash Acceleration Unit
(FAU) is the interface between the flash memory blocks and the system. In a typical
configuration, the core and system bus clock speeds are clock significantly faster than the
flash memory clock. The FAU includes features designed to accelerate flash accesses.
For more detailed information, refer to the FMC (same module as FAU) section in
AN4745: Optimizing Performance on Kinetis K-series MCUs
.
Chapter 16 Flash Acceleration Unit (FAU)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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