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Specification question for an application

Hi,

For my application, I need to process ECG and PPG signals (Sampled at about 400 Hz) and implement a real time PID control driving a slave controller. 

For those experienced with this line of processors, do you think they will cut it for my need? I am skeptical about on chip memory size. 

Low power is not a necessity for my application. One of the main reasons I started looking at this line is because these come with a nice evaluation boards compatible with ECG front end modules, for easy development. So if you have suggestions for another line of DSPs, please share your thoughts.

Thank you.