Memory bandwith, system bandwidth for bf548


Could you give advice or share link to doc, regarding memory/system bandwith (L1,L2,DDR) in case of system with:

-duplex eppi (RX/TX buffers),

-duplex sport2sport communication (to second processor 2TX/2RX buffers)

-sport2DAC/ADC (2RX/2TX buffers) simultaneous communication.

As per now system I have,  works fine only with 2 of them (eppi with sport2DAC/ADC, or eppi with sport2sport for example) when I include third one system is unstable and sport2sport transmission hang.