Resolved! On the STM32U5xx, how many cycles does the MDF need to process a sample?
In other words, what is the relation between F_RS (and possibly F_PCM) and mdf_ker_clk in DFLT? I use every block in DFLT: ADC1 -> DFLT (CIC, offset, scale, RSFLT, HPF, INT) The reference manual mentions only the RSFLT block with up to 24 ticks, but ...