Can a memory controller read from memory and send from memory simultaneously and is the main system bus involved in this reading from memory?

I posted a question I still do not understand but this is more about how read and send operations can even be interleaved. If the bus is being used to send data then how can it be used to read data?

Or is data sent from the CPU itself after being read into registers there?

  • $\begingroup$ Depends on the specific memory controller. Some might have separate read and write busses. There isn't always a "main system bus" $\endgroup$
    – user253751
    Aug 13 at 16:00

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