I am building ultrasonic system that needs to generate three different signals for three transducers at the same time.The system is controlled via DSP. Currently I have a DAC with 4 outputs, but as I understood it can only update either one output at a time with different value or all of them but with the same value. My new idea is to use three DACs, but I am trying to figure out how to simultaneously update different values to them. I could use different McBsp and SPI ports of DSP eval board that are clocked, but how to make the execution of transmission parallel? Any ideas?