Strictly speaking this is multi-processing but Erik makes a very valid point. Using more than one processor is a perfectly valid technique for decomposing an overall design into (largely) independent functional units. This is no different than deciding to put a bit of high speed logic into an FPGA and controlling it with a micro.

In other words, there is more than one way of skinning a cat.

As competent engineers, it is essential we are aware of all the possible techniques for solving the problems we are faced with.

Ian