By access do you mean read or write? I am using that right now and it is just 2 cycles to write (SBBO) and total 8 cycles for it to take effect (the PRU is free

By access do you mean read or write? I am using that right now and it is just 2 cycles to write (SBBO) and total 8 cycles for it to take effect (the PRU is free to do other stuff after the 2 cycles). Better of reading from the PRU pins though, just 1 cycle. Maybe you can use the other PRU to read from DDR and signal when the data is ready , if using the non PRU pins is the only way to go.