Exercise 7.15 A systolic array is an example of an MISD machine. A systolic array is a pipeline network or “wavefront” of data processing elements. Each of these elements does not need a program counter since execution is triggered by the arrival of data.

Clocked systolic arrays compute in “lock-step” with each processor undertaking alternate compute and com munication phases.

7.15.1 [10] <7.6> Consider proposed implementations of a systolic array (you can fi nd these on the Internet or in technical publications). Then attempt to program the loop provided in Exercise 7.14 using this MISD model. Discuss any diffi culties you encounter.

7.15.2 [10] <7.6> Discuss the similarities and differences between an MISD and SIMD machine. Answer this question in terms of data-level parallelism.