High-Performance Embedded Computing

288 Chapter 5 Multiprocessor Architectures

Each processor has some dedicated I/O devices. They also share some

devices through the MPU peripheral bridge. Only those devices likely to be used

by both the ARM9 and the C55x are put on the peripheral bridge bus.

The processing elements in a multiprocessor perform the basic computations of

the system. A PE may run only one process, or it may be shared among several

processes. A scientific processor typically uses the same type of CPU for all its

PEs to simplify programming. But an embedded processor can use a wide vari-

ety of PEs, including hardwired, single-function blocks of logic.

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