Syntax in the tech ref manual question

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1

In the reference manual, under the constants table are these two entries:

I am confused of the order change with the 0/1 and 1/0. I originally thought the 0/1 meant either PRU (the one that was currently being executed), but the send entry ( 1/0) would indicate there is some meaning more then that.

2

C24 is “this PRU” RAM offset
C25 is “that PRU” RAM offset

Running code on PRU0 you address PRU1 RAM using C25.
Same code if run on PRU1 will access the PRU0 RAM.