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Copy from DMA transfer data to buffer (int32_t buffer) by STM32H7

Senior III

From STM32H7 MDMA Presentation pdf:

MDMA is useful to collect data from other DMAs (DMA1/DMA2 and BDMA) and make data available to the CPU in the D1 domain (in DTCM or AXI-SRAM).

Does it mean we can access the data transferred from memory to peripheral by DMA? Assume I'm transferring from RNG (Rnadom number generator) data register to peripheral. Then we don't know what have been transmitted. Maybe this ability of chip could help? Then how to read DMA1/2 buffer through MDMA?

I know there are other way of doing it but this can be really appealing if possible.