Computers as Components, 2nd Edition

388 CHAPTER 7 Multiprocessors

7.9.2 Specification

The specification for the system is relatively straightforward because the algorithm

is simple. Figure 7.28 defines some classes that describe basic data types in the

system: the motion vector, the macroblock, and the search area. These definitions

are straightforward. Because the behavior is simple, we need to define only two

classes to describe it: the accelerator itself and the PC. These classes are shown in

Figure 7.29. The PC makes its memory accessible to the accelerator. The accelera-

tor provides a behavior compute-mv( ) that performs the block motion estimation

algorithm. Figure 7.30 shows a sequence ...