Figure 36. Mode2 Write Access Waveforms; Figure 37. Modeb Write Access Waveforms - ST STM32L4x6 Reference Manual

Flexible static memory controller (FSMC)
The differences with Mode1 are the toggling of NWE and the independent read and write
timings when extended mode is set (Mode B).
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Figure 36. Mode2 write access waveforms

Figure 37. ModeB write access waveforms

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