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Memory Access on PRUSS for AM335x

vaishali shah
Prodigy 30 points

Hi,

Since the AM335x TRM, shows that the memory map for instruction RAM and data Ram of PRUSS are both 0x0000_0000, so how does the PRU access the instruction RAM or data RAM since both seem to start at the same address.

Regards,

Vaishali

  • 0
    TI__Intellectual 1835 points

    The PRU instructions are accessed over an internal "instruction" bus.

    The data RAM is over a bus interface that is different from instruction bus. That is why it is okay to have instruction address same as data address as the two address spaces are distinct.

    Also, note that PRU does not use bandwidth on data address bus when accessing instructions.

    The PRUs also have their own private address space inside the subsystem. So, the address from ARM and from PRU are often different for same address locations.

    Thanks.