Figure 467. Muxed Read Access Waveforms; Figure 468. Muxed Write Access Waveforms - STMicroelectronics STM32F405 Reference Manual

Flexible memory controller (FMC)
Muxed mode - multiplexed asynchronous access to NOR Flash memory
The difference with mode D is the drive of the lower address byte(s) on the data bus.
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Figure 467. Muxed read access waveforms

Figure 468. Muxed write access waveforms

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